Southeast Asia is a very diverse region, with numerous ethnic groups of different origins.

Pre-historic Southeast Asia was lightly populated. The first group of people known to populate Southeast Asia were the Austroasiatic peoples, who were believed to have originated in what is today southern China, and are believed to be the ancestors of today's Vietnamese, Khmer and Mon peoples. Later groups to follow including the Tai people, who are believed to be the ancestors of today's Thai, Lao and Shan peoples, Sino-Tibetan peoples who are believed to be the ancestors of today's Bamar and Rakhine peoples, and the Hmong. The Malay Archipelago and Malay Peninsula were mainly populated by Austronesian peoples, who are believed to trace their origins to the indigenous peoples of Taiwan.

Indian influences would begin to grow among the various Southeast Asian peoples starting from the first century AD, in a process known as Indianization. The exact way through which this happened is disputed, though the most popular theory is that Brahmins travelling in the ships or caravans of traders from India brought Hinduism and later, Buddhism with them and spread it to the elite classes, from whom it trickled down to the rest of the population. The Indic scripts still used to write modern Thai, Lao, Burmese and Khmer have their roots from this process, and those languages, along with others such as Javanese, Balinese, Malay and Cham would adopt many loan words from Sanskrit. Many of these peoples would eventually build powerful Indianized kingdoms, including the Khmer Empire, Champa, Funan, Bagan Empire, Sukhothai Kingdom, Srivijaya and Majapahit. Today, Hinduism is primarily concentrated on the Indonesian island of Bali, though many traditions and stories of Hindu origin continue to survive throughout the region, even among peoples who are Buddhist, Muslim or Christian. Theravada Buddhism, on the other hand, is the dominant religion in Thailand, Myanmar, Cambodia and Laos, albeit still syncretised with Hinduism and local folk religions to varying extents.

Vietnam, on the other hand, would come to be heavily influenced by China, having been occupied by the Chinese Han, Tang and Ming dynasties. While the Vietnamese eventually succeeded in driving the Chinese out each time, the Chinese would leave a deep impact on Vietnamese society, with Confucianism and Taoism being hugely influential in shaping Vietnamese social etiquette, and the Chinese system of bureaucracy being adopted by many Vietnamese dynasties. Mahayana Buddhism also made its way into Vietnam via China, and although the official census today says that most Vietnamese are non-religious, most Vietnamese still practise a syncretic mix of Taoism, Confucianism, Mahayana Buddhism and Vietnamese folk religion to one degree or another. Vietnam also adopted Chinese characters to write the Vietnamese language, though this was replaced by the Latin alphabet during the French colonial period.

Islam would arrive with Arab traders in the 7th century, and start spreading throughout much of the Malay Archipelago in the 12th century. The Malacca sultanate was initially founded as a Hindu kingdom, but converted to Islam in the 15th century, thus becoming the first powerful Muslim kingdom in the region, and leading to Islam becoming the dominant religion in the Malay Archipelago. The Arabic script would also be adopted to write the Malay language, though it was largely replaced by the Latin alphabet under British colonial rule. The Arabic script continues to be official in Brunei, and is used by some in more conservative Malaysian states such as Terengganu and Kelantan, though it is far less common than the Latin alphabet in both countries outside of religious publications.

Southeast Asian history is very diverse and often tumultuous, and has to an important extent been shaped by European colonialism. The very term Southeast Asia was invented by American Naval strategists around 1940. Prior to WWII, Southeast Asia was referenced in terms of their colonial powers; farther India for Burma and Thailand, with reference to the main British colony of India, although Thailand itself was never colonised; Indochina referred to the French colonies of Cambodia, Vietnam and Laos, while Indonesia and parts of maritime Southeast Asia were called the Dutch East Indies. Peninsular Malaysia and Singapore were known as British Malaya, while Sabah was known as British North Borneo. Sarawak, on the other hand, was the Kingdom of Sarawak, ruled by a British family known as the White Rajahs. Brunei was also made into a British protectorate, with the British taking charge of its defence and foreign affairs. The Philippines was named the Spanish East Indies during the initial period of Spanish colonial rule, and later came to be known by its current name in honour of King Philip II of Spain, a name which stuck even after the islands were transferred from Spanish to American colonial rule. East Timor was colonized by Portugal for 273 years, then occupied by Indonesia for 27 years before becoming the first nation to gain independence in the 21st century. This massive colonisation effort was fueled by the lucrative spice trade, which in turn encouraged heavy immigration of workers to support the harvest and sale of plantation crops like nutmeg, rubber and tea.

World War II was disastrous to Southeast Asia (see Pacific War for a detailed guide), and also saw the beginning of the end of Western colonialism, as the Western powers surrendered to Japan one by one in disgrace. By the end of 1942, the Japanese had conquered virtually the whole of Southeast Asia, with only Thailand remaining unconquered, as the Thais signed a treaty of friendship with the Japanese that allowed the Japanese to establish military bases in Thailand, and allowed Japanese troops free passage through Thailand. The Japanese occupation was a time of great hardship for many of the natives, as the Japanese took all the resources for themselves, and exploited and in many cases outright enslaved the locals for their own gain. They were also for the most part more brutal than the Western colonial powers to the people under occupation, especially towards the ethnic Chinese. However, the Japanese occupation convinced many locals that the Western powers were not invincible after all, and thereby had the effect of helping the independence movements to gain pace after the end of the war.

After the war, the decolonisation process started in Southeast Asia, with the Americans granting independence to the Philippines in 1946, while the British granted independence to Burma in 1948, followed by Malaya in 1957 and eventually Singapore, Sarawak and North Borneo in 1963, which federated with Malaya to form Malaysia. After some ideological conflicts, Singapore was expelled from Malaysia in 1965 and became a sovereign state. In contrast to the relatively peaceful withdrawals by the British and Americans, the Dutch and the French fought bloody wars in an effort to hold on to their colonies, and earned humiliating defeats. Indonesia gained independence from the Dutch in 1949, and Indochina forced the French military to withdraw and separated into the countries of Laos, Cambodia, and Vietnam in 1954; see Indochina Wars. However, Vietnam would be split into two, with Ho Chi Minh establishing a communist regime with the support of the Soviet Union in the north, and Ngo Dinh Diem establishing a capitalist regime with the support of the United States in the south. This ideological conflict would spark off the Vietnam War in 1955, and it only ended in 1975 when a North Vietnamese tank drove into the Presidential Palace of South Vietnam in Saigon, and unified the country under communist rule.

European colonialism came to an end in Southeast Asia in 1984, when Brunei was granted full independence by the British. Indonesia occupied East Timor in 1975 after it declared independence from the Portuguese following a coup in Portugal, and only left in 1999 following a United Nations referendum. East Timor was then occupied by a United Nations peacekeeping force, before finally becoming independent in 2002. The 2004 Indian Ocean tsunami was devastating to parts of the Indonesian island of Sumatra (especially Aceh, which lost well over 100,000 people to the roiling waters), Thailand, Myanmar and Malaysia.

Since the 1990s, Southeast Asia has had a relatively high rate of economic growth, with Malaysia, Indonesia, the Philippines, Thailand and Vietnam often being called the "Tiger Cub Economies" (in reference to the original East Asian Tigers of Singapore, Hong Kong, Taiwan and South Korea). Nevertheless, despite being one of the most fertile and resource rich regions in the world, widespread corruption means that poverty is still an issue in many countries, with much of the wealth concentrated in the hands of an elite few. In the 21st century, China is increasingly becoming a major player in the region; China is now the largest source of international tourists to most Southeast Asian countries, and has also invested substantially in infrastructure under the auspices of the Belt and Road Initiative.

Southeast Asia's culture is dominantly influenced by the Indians and Chinese as well as its colonizers, and also natives of the Malay archipelago. For at least 2000 years (and to this day), Southeast Asia has acted as a conduit for trade between India and China. Large-scale immigration, however, only began with the advent of the colonial era. In Singapore, the Chinese form a majority of the population, but there are substantial Chinese, Indian and other minorities, assimilated to varying degrees, across all countries in the region.

Many large businesses in Southeast Asia are owned by ethnic Chinese, who tend to have a disproportionately large economic clout relative to their population. They have long been resented by other segments of the population, and are often the target of discriminatory laws and in extreme cases, even ethnic violence. However, progress is being made, with some countries such as Indonesia, Thailand and Vietnam having since repealed many of the said discriminatory laws.

Thai, Burmese, Cambodian and Lao cultures are heavily Indian-influenced in areas such as faith, folklore, language and writing, but have also absorbed heavy Chinese influences in their cuisines. Malaysia, Indonesia and Brunei are also influenced by the Indians, Malays and Chinese with a touch of Arab culture due to the large Muslim populations. Vietnam is the most Chinese-influenced. East Timor's culture is influenced notably by the Portuguese and the Malays. Singaporean and Filipino cultures are the most diverse: Singapore's is a mix of Malay, Indian, Peranakan, British, American and Chinese cultures while the Philippines is heavily influenced by American, Spanish, Malay, Chinese, Japanese and Portuguese influences with less coming from India, Mexico and non-Iberian parts of Europe, making it perhaps the most Westernized nation in the region.

Although Hinduism used to be dominant in the region, these days most Southeast Asians adhere to either Islam, Christianity or Buddhism. However, vestiges of Hinduism continue to survive in the folk tales and cultural practices of many Southeast Asians regardless of religion, and some nominally Muslim Javanese people practise a syncretic religion known as Kejawen that fuses Muslim, Hindu and animist beliefs.

Southeast Asia is religiously diverse. Malaysia, Indonesia and Brunei are predominantly Sunni Muslim, while East Timor and the Philippines are predominantly Roman Catholic. Buddhism is the dominant religion in Thailand, Myanmar, Laos, Cambodia and Vietnam, with Mahayana Buddhism being the dominant form in Vietnam, and Theravada Buddhism being the dominant form in the other countries. Singapore is by some measures the most religiously diverse country in the world and does not have a majority religion, though Mahayana Buddhism forms a plurality.

However, religious minorities exist in every country. The ethnic Chinese minorities in the various countries practice a mix of different religions, including Taoism and Mahayana Buddhism. Hinduism is still observed in parts of Indonesia, most notably Bali, as well as by the Cham community in Vietnam, and a sizeable proportion of the ethnic Indian communities in Malaysia, Singapore, Thailand, Myanmar and Indonesia. The southern parts of Thailand and the Sulu Archipelago of the southern Philippines are home to ethnic Malays who mostly practice Islam, and the Philippine island of Mindanao is also home to a sizable Muslim community. Christian minorities also exist in every country, most notably in Papua, East Nusa Tenggara and North Sulawesi in Indonesia, as well as in East Malaysia, and in the border area of Thailand and Myanmar. Animistic tribal religions are also practised, especially by some of the people living in remote jungle or mountainous areas.

Southeast Asia is tropical: the weather hovers around the 30°C mark throughout the year, humidity is high and it rains often.

The equatorial parts of Southeast Asia, including Malaysia, Brunei, Indonesia, Singapore, the Philippines and southern Thailand, have two or three seasons — wet, dry, and a nameless rest of the year when it sometimes rains and sometimes does not — with the dry season somewhat hotter (up to 35°C) and the wet season somewhat cooler (down to 25°C). The wet season usually occurs in winter, and the hot season in summer, although there are significant local variations.

In Indochina (north/central Thailand, Laos, Cambodia, southern Vietnam, Myanmar), the seasons can be broken down into hot, wet and dry, with the relatively cool dry season from November to February or so being the most popular with tourists. The scorching hot season that follows can see temperatures climb above 40°C in April, cooling down as the rains start around June. However, even in the "wet" season, the typical pattern is sunny mornings with a short (but torrential) shower in the afternoon, not all-day drizzle, so this alone should not discourage you from travel.

Northern Vietnam has four distinct seasons, with a climate similar to that of Hong Kong and Taiwan.

Southeast Asia is also home to many mountains, and conditions are generally cooler in the highlands. In equatorial Southeast Asia, highland temperatures generally range from about 15-25°C. Some of the highest mountains in Indonesia, Vietnam, and Myanmar are so high that snow falls every year, and Indonesia and Myanmar are even home to permanent glaciers.

In Malaysia, Brunei, Singapore, and parts of Indonesia (notably Sumatra and Borneo) and the Philippines (notably Palawan), haze from forest fires (usually set intentionally to clear land for agriculture) is a frequent phenomenon in the dry season from May to October. Haze can come and go rapidly with the wind.

The main international gateways to Southeast Asia are Bangkok (BKK ^IATA), Singapore (SIN ^IATA), Kuala Lumpur (KUL ^IATA), and Jakarta (CGK ^IATA). Other airports with good connections outside the region include Manila (MNL ^IATA), Denpasar (DPS ^IATA), Phuket (HKT ^IATA), Ho Chi Minh City (SGN ^IATA) and Hanoi (HAN ^IATA). Hong Kong also makes a good springboard into the region, with many low-cost carriers flying into Southeast Asian destinations.

Travellers from the U.S. and Canada can often find competitive prices on Taiwan's EVA Air, Hong Kong's Cathay Pacific, Japan's ANA and Japan Airlines, and South Korea's Korean Air connecting through their respective hubs, while travellers from Latin America, Africa and Europe can often find competitive prices on the Gulf trio of Emirates, Qatar Airways and Etihad Airways.

Singapore Airlines, Malaysia Airlines and Thai Airways are all known for their great service and safety records. Philippine Airlines is the oldest airline in this part of the world still flying under the original name, while Vietnam Airlines and Garuda Indonesia are slowly but surely growing their intercontinental networks. Rapidly expanding AirAsia flies out of its Kuala Lumpur hub to many major East Asian and South Asian cities, as well as long-haul routes to Sydney, Melbourne, Perth and Auckland, with connections available to other Southeast Asian cities through its Kuala Lumpur hub. AirAsia also operates several secondary hubs in Jakarta, Bangkok and Manila, as well as a dense network into Singapore. In addition to AirAsia, long-haul budget flights can be booked into the Jetstar and Scoot hub in Singapore or the Cebu Pacific hub in Manila.

Travellers to ASEAN nations are starting to benefit from the ASEAN Single Aviation Market policy, a gradual process of opening up the markets which is moving slowly but surely. There are also many ambitious airport construction and expansion projects throughout the region to meet booming demand.

There is a railway line to Hanoi, Vietnam from Nanning, China. There are no connections between Vietnam and other Southeast Asian countries yet, although there are plans for links through both Cambodia and Myanmar onward to the existing Thailand-Malaysia network. A new railway line from Kunming, China to Vientiane, Laos was completed in December 2021, with one international train in each direction daily since April 2023. There are plans to eventually extend the railway all the way to Bangkok, Kuala Lumpur and Singapore, but completion is still a long way away. Such plans have existed since the colonial era, but China's Belt and Road Initiative has injected them with new vigor and capital.

Southeast Asia is a popular destination for round the world cruises, and many of them make several stops in Southeast Asia with the option to go for shore excursions. Popular ports of call include Singapore, Langkawi, Penang, Tioman, Redang, Phuket, Nha Trang, Ha Long Bay, Ho Chi Minh City and Ko Samui.

Much of Southeast Asia is now covered by a dense web of low-cost carriers, the largest being Malaysian carrier AirAsia and its Thai, Indonesian, Filipino and Cambodian affiliates, making this a fast and affordable way of getting around. Bangkok, Jakarta, Kuala Lumpur and Singapore are the main hubs for budget airlines in the area.

Full-service carriers have spun off their own low-cost airlines to compete, which have taken over many leisure routes completely. Examples include Scoot in Singapore, Thai Smile^{[dead link]} in Thailand and Firefly^{[dead link]} in Malaysia. These larger multinational budget airlines and most national carriers are respectable, but some of the smaller airlines have questionable safety records, especially on domestic flights using older planes. Do some research before you buy.

Services along the main Jakarta-Singapore-Kuala Lumpur-Bangkok business corridor are extremely frequent, with frequencies almost like a bus service in the daytime, meaning that competition is stiff and prices are low if you book in advance.

Due to the high rates of road accidents in most the region, trains in Southeast Asia are generally considered to be a safer option than buses, especially during the night, although in most cases the journey by train takes longer than by bus. Most of Southeast Asia's railways are relics of the colonial era, meaning that they are mostly single track and use diesel locomotives, so delays are common, and speeds are rather slow.

Thailand has the most extensive network, with relatively frequent and economical (albeit slow, compared to most buses) and generally reliable services. The main lines from Bangkok are north to Chiang Mai; northeast via Nakhon Ratchasima (Khorat) to Nong Khai and also east to Ubon Ratchathani; east via Chachoengsao to Aranyaprathet and also southeast via Pattaya to Sattahip; and south via Surat Thani (province) to Ko Samui, Ko Pha Ngan, Ko Tao and Hat Yai, through Malaysia via Butterworth, Kuala Lumpur, and Johor Bahru, to Singapore.

Vietnam has a line linking the country from north to south but again, speeds are rather slow.

The networks in Indonesia and Myanmar are more limited and decrepit and perhaps best experienced for their nostalgic value. The Philippines has a limited railway network in Luzon island, which fell into neglect, but is slowly being rebuilt and expanded through foreign aid. Cambodia's railways were badly hit by the civil war, but have been rehabilitated in the 2010s; there are two lines radiating out of Phnom Penh; one to the seaside resort town of Sihanoukville, and the other to the second largest city Battambang.

Malaysia and Laos have relatively fast, modern, comfortable and electrified railways. The Kunming-Vientiane railway line has trains travelling at up to 160 km/h in the Lao section, crossing the border into Laos from China at Boten, before continuing through on to Vientiane via Luang Prabang and Vang Vieng. In Malaysia, KTM's ETS service runs along the West Coast of Peninsular Malaysia from Gemas to Padang Besar at the Thai border (where you can transfer onto Thai trains), passing through Kuala Lumpur and Ipoh along the way, and with a branch line heading from Bukit Mertajam to Butterworth (for transfers to the ferry to George Town). Trains on this line can hit a top speed of 140 km/h.

The sole high-speed rail line in Southeast Asia is the Jakarta-Bandung line on the Indonesian island of Java. Plans to extend this line to Surabaya have been mooted, but have construction has yet to start. A high-speed rail line in Thailand from Bangkok to Nong Khai at the Lao border is under construction, but completion is still years away.

Buses are a cheap and popular mode of transport in Southeast Asia. They tend to be faster than the train and serve more cities in countries with limited to non-existent rail networks, but less safe due to the local driving habits and road conditions.

Classes and styles of buses vary by country, but most Southeast Asian countries have luxury or first-class buses on long-haul routes between major cities. Minibuses or buses without air-conditioning are common in poorer regions. Local buses tend to be available only in the large cities. Cross-border bus services are also available.

International ferry links are surprisingly limited, but it's possible to cross over from Malaysia to Sumatra (Indonesia) and from Singapore to the Riau Islands (Indonesia) and Johor (Malaysia). Various cruises also operate between Singapore, Malaysia, and Thailand, occasionally venturing as far as Cambodia, Vietnam, and even Hong Kong.

Domestic passenger ferries link various islands in Southeast Asia, particularly in Indonesia and the Philippines, but safety regulations are often ignored, boats overloaded and sinkings are not uncommon. Be sure to inspect the boat before you agree to get on, and avoid boats that look overcrowded or too run down.

Getting around continental Southeast Asia as well as intra-island travel in the various islands of Southeast Asia by car is possible, but definitely not for the faint-hearted. While you can drive yourself around Singapore, Malaysia, Thailand and Brunei without any major problems after giving yourself some time to get used to the relative lack of road courtesy, traffic conditions elsewhere range from just bad to total chaos. As such, it is advisable to rent a car with a driver, and not try to drive yourself around.

Traffic moves on the left in Indonesia, Malaysia, Thailand, Brunei, East Timor and Singapore, and moves on the right elsewhere.

See also: Wildlife in South and Southeast Asia

From active volcanoes to spectacular coastlines, from pristine rainforests to equatorial glaciers, and from impressive rice terraces to great river systems. Southeast Asia has it all. There are fourteen natural UNESCO World Heritage sites in the region, with dozens more on the tentative list, and hundreds of national parks and otherwise protected nature areas.

Most countries in Southeast Asia have impressive mountain ranges. The highest mountains of the region (more than 5,000 m) can be found in the eastern end of the Himalayas in Northern Myanmar, but almost equally high are the mountains of the Lorentz National Park of Indonesia's Papua province, known for their equatorial glaciers. Another high mountain (almost 4,100 m), that is easier to reach and therefore popular for climbing, is Mount Kinabalu in the Malaysian part of Borneo. As Southeast Asia is on the Ring of Fire of the Pacific Ocean, there is a large number of (active) volcanoes, mainly in Indonesia and the Philippines. The highest volcano of the Philippines is Mount Apo. The Indonesian archipelago has more than 100 active volcanoes, with the most active one being Mount Merapi (including eruptions in 2020), and the most popular tourist destination being Mount Bromo.

Tropical rainforests dominate the landscape in much of Southeast Asia, from the monsoon forests of the mainland to the equatorial evergreen rainforests of the islands of Indonesia and the Philippines. Some of the key rainforest national parks on the mainland include Khao Sok and Khao Yai in Thailand and Taman Negara in Malaysia. The rainforests of Sumatra and Borneo are known as the habitat of the orangutan. Many of the rainforests and other landscapes in Southeast Asia are home to (critically) endangered animal species, such as several primate species in Vietnam's Cuc Phuong area, the Javan rhinoceros in Indonesia's Ujung Kulon lowland rainforest, and the Indochinese tiger in several areas of Southeast Asia's mainland, notably the Thungyai-Huai Kha Khaeng Wildlife Sanctuaries. The Komodo National Park in Indonesia is home to the world's largest lizard, the Komodo dragon.

The key river of Southeast Asia, often called the lifeblood of the Indochina region, is the Mekong, that flows from China towards the South China Sea, passing five Southeast Asian countries on its way: Myanmar, Laos, Thailand, Cambodia, and Vietnam (the Mekong Delta). In Cambodia, the Mekong creates the unique ecological phenomenon of the Tonle Sap lake. Also in Cambodia, around the town of Kratie, river dolphins can be found. The second-longest river of the region is the Salween, flowing mostly in Myanmar. An interesting river is the subterranean river of Puerto Princesa in the Philippines, with 8 km in length possibly the longest underground river in the world. Apart from Tonle Sap, other large lakes in the region include the densely populated Inle Lake of Myanmar, and Indonesia's Lake Toba, that is actually a huge volcano crater. In several places in Southeast Asia, rivers and lakes are used for floating markets or villages, with famous examples including the floating villages surrounding Siem Reap (Cambodia), and the floating markets of Thailand including Damnoen Saduak and of Indonesia including Banjarmasin.

Geological formations and landscapes of interest are plenty in Southeast Asia. Prime examples include the karsts of Vang Vieng in Laos, the chocolate hills of Bohol in the Philippines, and the caves and grottos of Phong Nha-Ke Bang in Vietnam. Interesting coastal and marine landscapes include the limestone rock formations of Ao Phang Nga in Thailand, and ocean karsts at Ha Long Bay in Vietnam and Raja Ampat in Indonesia. More information on spectacular beaches (including for surfing) and underwater life (for diving and snorkelling) can be found in the Do section below.

In addition to natural landscapes, also many agricultural landscapes in Southeast Asia are spectacular. The key crop in most of the region is rice, with five Southeast Asian countries in the world's top 10 of rice producing countries. Some regions that are known for their stunning rice terraces include the Cordillera region of the Philippines, the region surrounding Sa Pa in Vietnam, and the Indonesian island of Bali. The cultural landscape of Bali, including the traditional subak irrigation system dating back to the 9th century, is on the World Heritage List. Other common crops in Southeast Asia include coffee, tea, rubber, sugar, tobacco, and a wide variety of tropical fruits. Famous regions with extensive tea plantations include the Cameron Highlands of Malaysia, and the Puncak mountain pass area of Indonesia.

All of the larger cities in Southeast Asia boast a range of museums, with the capital cities standing out. The region's best-known culture and history museums include Singapore's National Museum (in Orchard) and Asian Civilisations Museum (in Riverside). Also most of the other capital cities have a National Museum focusing on the country's culture and history, including Bangkok (Rattanakosin), Jakarta (Central), Phnom Penh, Hanoi, Manila (Ermita), and Kuala Lumpur (Brickfields). Also in Brickfields, the Islamic Arts Museum Malaysia provides the largest collection of Islamic art in the region. The Vietnamese capital, Hanoi, also has several great culture and history museums, such as the Fine Arts Museum and the Vietnam Museum of Ethnology. The historical city of Malacca is home to the Baba & Nyonya Heritage Museum, which showcases the culture of the Peranakans, the descendants of 15th-century Chinese immigrants who married the local Malays.

Throughout the region, there are museums commemorating specific events in the regional and local history. This includes for example the War Remnants Museum in Ho Chi Minh City on the Vietnam War, the Tuol Sleng Genocide Museum in Phnom Penh on the Cambodian genocide, the Aceh Tsunami Museum in Banda Aceh, Indonesia on the 2004 Boxing Day tsunami that killed about 250,000 people (more than half of them in Aceh), and the Resistance Museum in Dili on the East Timorese struggle for independence.

Among the key places to go for modern art collections are Singapore (for example the National Gallery in the Riverside district) and the town of Ubud in Bali, which boasts dozens of art galleries and museums.

Botanical gardens are plentiful throughout the region. The most extensive and well known among them include the Botanic Gardens in Singapore's North and West district, the Nong Nooch Tropical Garden near Pattaya in Thailand, and the Botanical Gardens of Bogor in Indonesia.

Southeast Asia has a huge number of archaeological sites, ranging from prehistoric remains of early humans that may be more than 1 million years old to great Hindu and Buddhist temples from the 8th to 14th centuries. Historic sights from the precolonial era are covered in this section, while colonial heritage is covered in the next section.

Three prehistoric archaeological sites in Southeast Asia are on the World Heritage List. The so-called Sangiran Early Man Site can be found near Solo in Indonesia, with fossils of early humans (related to the 'Java Man') that are estimated to be between 700,000 and 1,000,000 years old, possibly older. In Malaysia's Perak state, the Lenggong Valley contains four archaeological sites with tools, weapons jewellery and other equipment from various ages, and the 'Perak Man' skeleton. The archaeological site of Ban Chiang near Udon Thani in Thailand includes pottery that was painted red and dates to 2,000-4,000 years ago.

Nowadays, Hinduism in Southeast Asia is mostly limited to the Indonesian island of Bali, the Cham community of Vietnam, and the Indian communities of Malaysia, Myanmar, Thailand and Singapore, while Buddhism is concentrated in Indochina, Thailand and Myanmar and among overseas Chinese communities throughout the region. However, from about the 4th to the 15th centuries, Hinduism, Buddhism and a combined observance of both were adhered to by the vast majority of Southeast Asians, and this led to the construction of many Hindu and Buddhist temples across the region. Two world-famous Buddhist temples, and major tourist attractions, are Borobudur in Indonesia (8th-9th centuries) and Angkor Wat in Cambodia (12th century, and partly a Hindu temple complex). Major Hindu temples include My Son (4th-14th centuries) in Vietnam, Prambanan (9th century; near the Borobudur temple) in Indonesia, Preah Vihear (11th-12th centuries) in Cambodia, and Vat Phou (11th-13th century) in Laos. All of these temples are World Heritage Sites.

Other key historic sights in Southeast Asia from precolonial times include the Sukhothai Historical Park in Thailand that used to be the capital of the Sukhotai Kingdom (13th-15th centuries), the Pyu Ancient Cities in Central Myanmar (2nd century BCE to 11th century), the ancient town and trading port of Hoi An in Vietnam (15th to 19th century), and the ancient capital of Ayutthaya in Central Thailand (14th century). Myanmar also boasts the archaeological sites of Bagan and Mrauk U, which were once the great capitals of ancient kingdoms of the Bamar and Rakhine ethnicities respectively, and each home to literally thousands of ancient temples. Near the city of Mandalay is Inwa, which served as one of the last capitals of the Burmese kingdom before it was conquered by the British. Two famous old citadels can be found in Vietnam: the 11th-century Hanoi Citadel and the 14th-century Citadel of the Ho Dynasty in the Central Coast region. The Central Coast also boasts the city of Hue, the last capital of the Nguyen Dynasty, which continued to rule in name under French suzerainty until 1945.

With the exception of Thailand, all Southeast Asian countries were under European colonial rule for varying lengths of time between the 16th and 20th centuries. As a result, there is a considerable colonial heritage in the region, including fortifications, infrastructure and buildings. Despite remaining independent, even Thailand did not escape European influence, and it too boasts several impressive European-style buildings.

One of the key historic towns of Southeast Asia is Malacca, the capital of the Malacca Sultanate that was subsequently under Portuguese, Dutch and British rule. Some of the highlights of Malacca include the Portuguese fortress A Famosa (1511) and St. Paul's Church (1521), and the Dutch Stadthuys (city hall, 1650). British colonial architecture can be found among others in Central Kuala Lumpur (such as the Government Offices built at the end of the 19th century) and in Singapore's Riverside area. Arguably the greatest concentration of British colonial architecture can be found in George Town and Yangon.

From 1619 to Indonesian independence, the capital of the Dutch East Indies was Batavia (present-day Jakarta). A huge number of colonial remnants can therefore be found in the city, ranging from the Batavia City Hall (built 1707–1710, now the Jakarta History Museum) in West Jakarta to the Neo-Gothic Jakarta Cathedral (built 1891-1901) in Central Jakarta. Also throughout the rest of the Indonesian archipelago, virtually every city and town has sights from the colonial time, such as the 17th-century Fort Rotterdam in Makassar, the 18th-century Fort Vredeburg in Yogyakarta, and many early 20th-century Art Deco masterpieces in Bandung. In the early 19th century, the Great Post Road was constructed across Java, enabling quick trade and development of the entire island.

A large number of Catholic churches were built in the Spanish Philippines, with four baroque churches listed on the UNESCO World Heritage List (among others the San Agustín Church in Manila's historic centre and the Miagao church in Iloilo). The historic town of Vigan is a Hispanic town well known for its cobblestone streets and unique mixed European-Oriental architecture. After the Philippines came under American rule, many Art Deco civil government buildings were constructed.

French colonial architecture can be found throughout former French Indochina. The former capital of Laos, Luang Prabang, is on the World Heritage List for its well-preserved blend of colonial and pre-colonial architecture. Similarly, the old towns of Hanoi and Hoi An in Vietnam have lots of buildings in French Colonial style, while its largest city, Ho Chi Minh City, is also home to several impressive French colonial buildings such as the Saigon Central Post Office, City Hall and the Saigon Opera House.

There are dozens of cities with a population of more than a million in Southeast Asia, and many of these have impressive cityscapes. The main modern city of the region is Singapore, whose Marina Bay area has a particularly recognizable skyline. The other main cities also have a large number of skyscrapers and office towers, notably Jakarta, Kuala Lumpur, Manila, Bangkok, and Ho Chi Minh City. The administrative capital of Malaysia, Putrajaya, is a planned city with a surreal mix of modernity and tradition.

Brunei is the only country of Southeast Asia that is a sultanate, and the residential palace of the sultan, Istana Nurul Iman, is considered the largest palace in the world. However, it is usually not accessible to the public, the exception being the second to fourth days of Hari Raya Aidilfitri (Eid al-Fitr), when the sultan holds an open house, exchanges greetings with male members of the public, and hosts the public to a free lunch. Throughout history, numerous sultanates have reigned over several parts of Southeast Asia, with some of the most powerful ones being the Mataram Sultanate (of which the remaining sultanates of Solo and Yogyakarta are successors) and the Malacca sultanate. Sultan palaces and related museums can be found throughout the region, especially in Malaysia and Indonesia.

With Malaysia, Brunei, and Indonesia being majority Muslim countries, there are many mosques in the region. Prominent mosques include the Istiqlal Mosque in Central Jakarta (the largest mosque of the region, with a capacity of 200,000), the Blue Mosque in Shah Alam, and the Omar Ali Saifuddien Mosque in Bandar Seri Begawan.

War-related sights (apart from the museums mentioned above) can be found in most of the countries in the region. In Cambodia, the Killing Fields of Choeung Ek near Phnom Penh offer a reminder of the Cambodian Genocide. In Vietnam, there are many sights related to the Vietnam War, such as the Demilitarized Zone around the former border between North and South Vietnam, and the Cu Chi tunnel system. In Indonesia, there are numerous sights related to the War of Independence, such as the Monas national monument in Central Jakarta.

Visitors with an interest in military history can find many remnants from the Pacific War and the Indochina Wars.

• Banana Pancake Trail
• Bangkok to Ho Chi Minh City overland

• Scuba diving is a major draw for visitors to Southeast Asia, with Indonesia, Malaysia, the Philippines and Thailand all boasting world-class diving locations.
• Surfing is also an increasing popular sport especially in Indonesia (with Nias and Bali the top draws) and the Philippines.
• Sailing is popular, especially in Southern Thailand
• Try wake boarding at Southeast Asia's largest wake boarding centre in Camarines Sur, Philippines.
• Explore one of the world's longest underground rivers in the Puerto Princesa Subterranean River National Park located in Palawan, Philippines.

Southeast Asia, in particular Indonesia and Thailand, is well known throughout the world for its traditional massages. While the conditions of massage parlours vary, those in major hotels in touristy areas are usually clean, though you would generally pay a premium for them. Nevertheless, prices remain much lower than in most Western countries, with 1-hour massages starting from around US$5–20.

• Southeast Asian Games - Known in short as the SEA Games, it is held every two years among the 11 countries of Southeast Asia in odd-numbered years. It is structured similarly to the Olympics, albeit on a much smaller scale, and also features several sports that are only popular within Southeast Asia such as sepak takraw (essentially volleyball played with the feet instead of hands, known for its spectacular overhead kicks), and silat (a Malay martial art). The last edition was held in Cambodia in 2023, and the next edition will be held in Bangkok, Thailand in 2025.
• Football (soccer) — The most popular sport in most of Southeast Asia except the Philippines (where basketball dominates). While the standard of play is nowhere near what you would get in Europe or even other parts of Asia, going to a football match is an excellent way to experience local culture. Thailand, Indonesia, Vietnam and Malaysia are are generally considered the best countries in Southeast Asia to experience football culture, with well-established domestic leagues, and respectable national teams by Asian standards. Matches between Thailand and Vietnam or Indonesia and Malaysia in particular are guaranteed to have electrifying atmospheres and draw sellout crowds.

Southeast Asia is cheap, so much so that it is among the cheapest travel destinations on the planet. US$20 is a perfectly serviceable daily backpacker budget in most countries in the region, while the savvy traveller can eat well, drink a lot and stay in luxury hotels for US$100 per day.

Some exceptions do stand out. The rich city-states of Singapore and Brunei are about twice as expensive as their neighbours, while at the other end of the spectrum, the difficulty of getting into and around underdeveloped places like Myanmar, East Timor and the backwoods of Indonesia drives up prices there too. In Singapore in particular, the sheer scarcity of land drives accommodation rates up and you would be looking at more than US$200 per night for a four-star hotel. Also, many countries in the region do not list taxes and service charges in their advertised accommodation prices so your actual room rate is up to 20% more than the what you see in search engines.

Southeast Asia is a shopping haven, with both high end branded goods and dirt cheap street goods. The most popular city for shopping in Southeast Asia is Bangkok, although Jakarta, Kuala Lumpur, Manila, Ho Chi Minh City and Singapore all have extensive arrays of exclusive shopping malls stocked with haute couture labels. On the other end of the spectrum, street markets remain a part of daily life (except in Singapore) and are the place to go for dirt cheap or counterfeit items. Some towns like Chiang Mai in Thailand and Ubud in Bali, Indonesia are well known for enormous markets selling traditional artworks, and it's often possible to buy directly from local artists or have dresses, jewellery, furniture, etc., made to order.

Clothes and accessories of international brands are usually just as expensive as in developed countries, or even more expensive. Branded products that seem considerably cheaper (such as Polo Ralph Lauren shirts in Indonesia) are typically counterfeit, even when they are not sold in the streets but in a legit-looking shop or air-conditioned shopping mall. If you need a good compromise between low price of street sold items and the quality of branded products, look for stores of domestic brands such as Malaysia's F.O.S or Philippines' Bench.

For slightly higher-end gifts, Malaysia's Royal Selangor is the world's foremost manufacturer of pewter products.

Bargain in public markets and flea markets where prices aren't fixed. Southeast Asians actually will give you a bargain if you make them laugh and smile while naming your price; if they don't, try saying bye bye and smile and maybe the vendor might change his mind and give you a discount. When bargaining for simple things like watches, sunglasses, and shoes remember that these are often marked up hugely and, given some bargaining skill, can often be brought down to something like 20% of the asking price. If you can't seem to get them down to a reasonable price, then you're doing it wrong. See Bargaining for more tips.

As a rule of thumb, if a price is not explicitly posted, you need to haggle for it. However even posted prices can often be haggled down as well.