The Austroasiatic languages are a large language family spoken throughout mainland Southeast Asia, South Asia and East Asia. These languages are natively spoken by the majority of the population in Vietnam and Cambodia, and by minority populations scattered throughout parts of Thailand, Laos, India, Myanmar, Malaysia, Bangladesh, Nepal, and southern China. Approximately 117 million people speak an Austroasiatic language, of which more than two-thirds are Vietnamese speakers. Of the Austroasiatic languages, only Vietnamese, Khmer, and Mon have lengthy, established presences in the historical record. Only two are presently considered to be the national languages of sovereign states: Vietnamese in Vietnam, and Khmer in Cambodia. The Mon language is a recognized indigenous language in Myanmar and Thailand, while the Wa language is a 'recognized national language' in the de facto autonomous Wa State within Myanmar. Santali is one of the 22 scheduled languages of India. The remainder of the family's languages are spoken by minority groups and have no official status.
Evidence of modern human presence in the northern and central highlands of Indochina, which constitute the territories of the modern Laotian nation-state, dates back to the Lower Paleolithic. These earliest human migrants are Australo-Melanesians—associated with the Hoabinhian culture—and have populated the highlands and the interior, less accessible regions of Laos and all of Southeast Asia to this day. The subsequent Austroasiatic and Austronesian marine migration waves affected landlocked Laos only marginally, and direct Chinese and Indian cultural contact had a greater impact on the country.
The Malay Peninsula is a peninsula in Mainland Southeast Asia. The landmass runs approximately north–south, and at its terminus, it is the southernmost point of the Asian continental mainland. The area contains Peninsular Malaysia, Southern Thailand, and the southernmost tip of Myanmar (Kawthaung). The island country of Singapore also has historical and cultural ties with the region. The indigenous people of the peninsula are Orang Asli and Malays, an Austronesian people.
Southeast Asia is the geographical south-eastern region of Asia, consisting of the regions that are situated south of China, east of the Indian subcontinent, and north-west of mainland Australia which is part of Oceania. Southeast Asia is bordered to the north by East Asia, to the west by South Asia and the Bay of Bengal, to the east by Oceania and the Pacific Ocean, and to the south by Australia and the Indian Ocean. Apart from the British Indian Ocean Territory and two out of 26 atolls of Maldives in South Asia, Maritime Southeast Asia is the only other subregion of Asia that lies partly within the Southern Hemisphere. Mainland Southeast Asia is entirely in the Northern Hemisphere. East Timor and the southern portion of Indonesia are the parts of Southeast Asia that lie south of the Equator.
The history of Southeast Asia covers the people of Southeast Asia from prehistory to the present in two distinct sub-regions: Mainland Southeast Asia and Maritime Southeast Asia. Mainland Southeast Asia comprises Cambodia, Laos, Myanmar, Peninsular Malaysia, Thailand and Vietnam whereas Maritime Southeast Asia comprises Brunei, Cocos (Keeling) Islands, Christmas Island, East Malaysia, East Timor, Indonesia, Philippines and Singapore.
French Indochina, officially known as the Indochinese Union and after 1947 as the Indochinese Federation, was a grouping of French colonial territories in Mainland Southeast Asia until its demise in 1954. It comprised Cambodia, Laos, the Chinese territory of Guangzhouwan, and the Vietnamese regions of Tonkin in the north, Annam in the centre, and Cochinchina in the south. The capital for most of its history (1902–1945) was Hanoi; Saigon was the capital from 1887 to 1902 and again from 1945 to 1954.
The Indomalayan realm is one of the eight biogeographic realms. It extends across most of South and Southeast Asia and into the southern parts of East Asia.
Dendrocalamus is a tropical Asian genus of giant clumping bamboos in the grass family. It is found in the Indian subcontinent, China, and Southeast Asia.
The Indochinese tiger is a population of the Panthera tigris tigris subspecies that is native to Southeast Asia. This population occurs in Myanmar and Thailand In 2011, the population was thought to comprise 342 individuals, including 85 in Myanmar and 20 in Vietnam, with the largest population unit surviving in Thailand, estimated at 189 to 252 individuals during the period 2009 to 2014.
Buddhism in Southeast Asia includes a variety of traditions of Buddhism including two main traditions: Mahāyāna Buddhism and Theravāda Buddhism. Historically, Mahāyāna had a prominent position in the region, but in modern times, most countries follow the Theravāda tradition. Southeast Asian countries with a Theravāda Buddhist majority are Thailand, Cambodia, Laos and Myanmar, all mainland countries.
Farther India, Further India, or Ultraindia, is an old term, now rarely used, for Southeast Asia, seen in colonial days from Europe as the part of the Far East beyond the Indian subcontinent, but south of China.
Islam is the most widely practised religion in Southeast Asia, numbering approximately 240 million adherents which translate to about 42% of the entire population, with majorities in Brunei, Indonesia and Malaysia as well parts of Southern Thailand and parts of Mindanao in the Philippines respectively. Significant minorities are located in the other Southeast Asian states. Most Muslims in Southeast Asia are Sunni and follow the Shafi`i school of fiqh, or religious law. It is the official religion in Malaysia and Brunei while it is one of the six official faiths in Indonesia.
Before the Tai people's southward migration from Guangxi since the 4th century, the Indochinese peninsula had already been populated by Australo-Melanesians who by around 30,000 BP had spread into all sub-regions. They left traces of the first local culture - the Hoabinhian, a name assigned to an industry and cultural continuity of stone tools and flaked cobble artifacts that appears around 10,000 BP in caves and rock shelters first described in Hòa Bình, Vietnam, later also documented in Terengganu, Malaysia, Sumatra, Thailand, Laos, Myanmar, Cambodia and Yunnan, southern China.
The following outline is provided as an overview of and topical guide to Cambodia:
The ancestral population of modern Asian people has its origins in the two primary prehistoric settlement centres – greater Southwest Asia and from the Mongolian plateau towards Northern China.
Urceola is a plant genus in the family Apocynaceae, first described as a genus in 1798. It is native to China, the Himalayas, Southeast Asia, and New Guinea.
The Indochinese leopard is a leopard subspecies native to mainland Southeast Asia and southern China. In Indochina, leopards are rare outside protected areas and threatened by habitat loss due to deforestation as well as poaching for the illegal wildlife trade. In 2016, the population was previously thought to comprise 973–2,503 mature individuals, with only 409–1,051 breeding adults. The historical range had decreased by more than 90%. However, as of 2019, it is estimated that there are 77-766 mature Indochinese leopards and that their numbers are decreasing.
The term Southeast Asian Massif was proposed in 1997 by anthropologist Jean Michaud to discuss the human societies inhabiting the lands above an elevation of approximately 300 metres (1,000 ft) in the southeastern portion of the Asian landmass, thus not merely in the uplands of conventional Mainland Southeast Asia. It concerns highlands overlapping parts of 10 countries: southwest China, Northeast India, eastern Bangladesh, and all the highlands of Myanmar (Burma), Thailand, Vietnam, Laos, Cambodia, Peninsular Malaysia, and Taiwan. The indigenous population encompassed within these limits numbers approximately 100 million, not counting migrants from surrounding lowland majority groups who came to settle in the highlands over the last few centuries.
Vietnamese irredentism, also known as Ideology of Greater Vietnam, sometimes may be referred to as Baiyue Nationalism is an irredentist and nationalist claim concerning redemption of former territories of Vietnam and territories outside Vietnam that the Vietnamese have inhabited for centuries. Notable claims are usually made concerning territories of Laos, Cambodia, and Liangguang.
Cambodia 
Laos 
Malaysia 
Myanmar (Burma) 
Thailand 
Vietnam 
