Southeast Asia^{[lower-alpha 4]} is the geographical southeastern region of Asia, consisting of the regions that are situated south of China, east of the Indian subcontinent, and northwest of the Australian mainland, which is part of Oceania.^[5] 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 the 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.

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Southeast Asia
Geopolitical map of Southeast Asia, including Western New Guinea, which is geographically part of Oceania
Area	4,545,792 km² (1,755,140 sq mi)
Population	675,796,065 (3rd)^[1]^[2]
Population density	135.6/km² (351/sq mi)
GDP (PPP)	$9.727 trillion^[3]
GDP (nominal)	$3.317 trillion (exchange rate)^[4]
GDP per capita	$5,017 (exchange rate)^[4]
HDI	0.723
Ethnic groups	Indigenous (Southeast Asians) Austronesian, Austroasiatic, Negrito, Sino-Tibetan, and Tai peoples East Asians South Asians
Religions	Buddhism^{[lower-alpha 1]} Islam^{[lower-alpha 2]} Christianity^{[lower-alpha 3]} Other: Confucianism, folk, Hinduism, irreligion, Taoism
Demonym	Southeast Asian
Countries	11 Brunei Cambodia East Timor Indonesia^{[note 1]} Laos Malaysia Myanmar Philippines Singapore Thailand Vietnam
Dependencies	Christmas Island Cocos (Keeling) Islands Andaman and Nicobar Islands
Languages	Official languages Burmese English Tagalog Khmer Lao Indonesian Malay Mandarin Portuguese Tamil Tetum Thai Vietnamese Other native languages Afro-Asiatic: Arabic Austroasiatic: Mon Khmer Vietnamese Aslian Austronesian: Javanese Sundanese Madurese Minangkabau Buginese Acehnese Batak Banjar Balinese Tagalog Tetum Cebuano Ilocano Hiligaynon Waray Kapampangan Pangasinan Bikol Masbateño Cham Iban Bidayuh Dusun Kadazan Lun Bawang/Lundayeh Moken Creoles: Betawi Ambonese Chavacano Tok Pisin Kristang Dravidian: Tamil Telugu Malayalam Great Andamanese: Aka-Jeru (Present Great Andamanese) Indo-European: Bengali English French Persian Portuguese Spanish Hindi/Urdu Dutch Sinhala Rohingya Ongan: Onge Jarawa Sentinelese ? Tai–Kadai: Thai Lao Shan Sino-Tibetan: Burmese Rakhine Karen Mandarin Cantonese Min Hakka Languages of Asia – All of the languages of Asia
Time zones	5 time zones UTC+5:30: Andaman and Nicobar Islands UTC+6:30: Cocos (Keeling) Islands • Myanmar UTC+7:00: Cambodia • Christmas Island • Indonesia • Laos • Thailand • Vietnam UTC+8:00: Brunei • Indonesia • Malaysia • Philippines • Singapore UTC+9:00: East Timor • Indonesia
Internet TLD	.bn, .id, .kh, .la, .mm, .my, .ph, .sg, .th, .tl, .vn
Calling code	Zone 6, 8 & 9
Largest cities	Capital cities Bandar Seri Begawan Phnom Penh Jakarta Vientiane Kuala Lumpur Nay Pyi Daw Manila Singapore Bangkok Dili Hanoi Largest cities Bandung Bekasi Bangkok Can Tho Da Lat Da Nang Cebu City Davao City Denpasar Depok George Town Hanoi Hai Phong Ho Chi Minh City Jakarta Kuala Lumpur Johor Bahru Makassar Manila Medan Palembang Quezon City Semarang Singapore Surabaya Tangerang Yangon Yogyakarta Banda Aceh Padang Ambon, Maluku Jayapura
UN M49 code	`035` – South-eastern Asia `142` – Asia `001` – World

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The region lies near the intersection of geological plates, with both heavy seismic and volcanic activities.^[6] The Sunda Plate is the main plate of the region, featuring almost all Southeast Asian countries except Myanmar, northern Thailand, northern Laos, northern Vietnam, and northern Luzon of the Philippines, while the Sunda Plate only includes western Indonesia to as far east as the Indonesian province of Bali. The mountain ranges in Myanmar, Thailand, Peninsular Malaysia, and the Indonesian islands of Sumatra, Java, Bali, Lesser Sunda Islands, and Timor are part of the Alpide belt, while the islands of the Philippines and Indonesia as well as East Timor are part of the Pacific Ring of Fire. Both seismic belts meet in Indonesia, causing the region to have relatively high occurrences of earthquakes and volcanic eruptions, particularly in the Philippines and Indonesia.^[7]

It covers about 4,500,000 km² (1,700,000 sq mi), which is 8% of Eurasia and 3% of Earth's total land area. Its total population is more than 675 million, about 8.5% of the world's population. It is the third most populous geographical region in Asia after South Asia and East Asia.^[8] The region is culturally and ethnically diverse, with hundreds of languages spoken by different ethnic groups.^[9] Ten countries in the region are members of the Association of Southeast Asian Nations (ASEAN), a regional organisation established for economic, political, military, educational, and cultural integration among its members.^[10]

Southeast Asia is one of the most culturally diverse regions of the world. There are many different languages and ethnicities in the region. Historically, Southeast Asia was significantly influenced by Indian, Chinese, Muslim, and colonial cultures, which became core components of the region's cultural and political institutions. Most modern Southeast Asian countries were colonised by European powers. European colonisation exploited natural resources and labour from the lands they conquered, and attempted to spread European institutions to the region.^[11] Several Southeast Asian countries were also briefly occupied by the Japanese Empire during World War II. The aftermath of World War II saw most of the region decolonised. Today, Southeast Asia is predominantly governed by independent states.^[12]