Southeast Asia

• 1. Geographic Foundations

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  The Sunda plate anchors the geological heart of Southeast Asia, yet it stops short of Myanmar and northern Thailand. This tectonic boundary creates a landscape defined by constant motion. The region sits at the intersection of heavy seismic activity and volcanic eruptions. In Indonesia, two major belts meet to produce frequent earthquakes. The Alpide belt runs through mountain ranges in Myanmar, Thailand, and Peninsular Malaysia. Meanwhile, the Pacific Ring of Fire encompasses the islands of the Philippines and eastern Indonesia. These forces have shaped the physical boundaries that define the subregion today. Most of the area lies south of China and east of the Indian subcontinent. Maritime Southeast Asia is the only part of Asia lying partly within the Southern Hemisphere. Timor-Leste and southern Indonesia sit below the equator. Mainland Southeast Asia remains entirely in the Northern Hemisphere. The total land area covers about 4.5 million square kilometers. This represents 8% of Eurasia and 3% of Earth's total land area.

• 2. Ancient Migrations

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  Homo erectus inhabited the region approximately 1.5 million years ago during the Middle Pleistocene age. Distinct Homo sapiens groups reached the area between 50,000 BC and 70,000 BC. Rock art dating from 40,000 to 60,000 years ago exists in the caves of Sulawesi and Borneo. This artwork is currently considered the world's oldest known figurative paintings. A bull depiction found in the Lubang Jeriji Saleh cave was estimated to be created around 40,000 to 52,000 years ago. Homo floresiensis lived in the area until at least 50,000 years ago before extinction. During much of this time, Western Indonesian islands formed a single landmass called Sundaland with the Malay Peninsula. The Gulf of Thailand was dry land connecting Sundaland to Mainland Southeast Asia. Basal-East Eurasian ancestry originated in Mainland Southeast Asia around 50,000 BC. East Asian-related ancestry spread across Southeast Asia by 15,000 BC. The Austronesian peoples migrated from Taiwan to the northern Philippines between 7,000 BC and 2,200 BC. They rapidly spread into Island Melanesia by 1300 BC. By 1000 BC, they reached the rest of Indonesia, Malaysia, southern Vietnam, and Palau.

• 3. Indianization Era

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  The first Indian-influenced polities were the Pyu city-states existing circa second century BCE in inland Myanmar. These states served as overland trading hubs between India and China. In the first century, Funan states centered in the Mekong Delta became dominant trading powers for about five centuries. Maritime Southeast Asia saw its first recorded Indianised kingdom, Salakanagara, established in western Java circa second century CE. Greeks knew this Hindu kingdom as Argyre or Land of Silver. By the fifth century CE, trade networking concentrated on maritime routes like Malacca and Sunda Strait. Srivijaya emerged as a dominant maritime power controlling both straits for more than 5 centuries. The Chola Empire invaded Srivijaya in 1025, reshaping regional power dynamics. The Khmer Empire experienced a golden age during the 11th to 13th century CE. Its capital Angkor hosts majestic monuments such as Angkor Wat and Bayon. Satellite imaging revealed that Angkor was the largest pre-industrial urban centre in the world at its peak. Mahayana Buddhism established presence in Maritime Southeast Asia brought by Chinese monks en route to Nalanda. Theravada Buddhism entered the region during the third century via maritime trade routes with Sri Lanka. Shaivism spread into Southeast Asia via the Bay of Bengal, Indochina, then Malay Archipelago. Thousands of Shiva temples exist on islands of Indonesia, Cambodia, and Vietnam.

• 4. Colonial Conquest

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  European influence started entering the region in the 16th century with Portuguese arrival in Malacca and Maluku. Spaniards settled the Philippines years later to trade between Asia and Latin America. Throughout the 17th and 18th centuries, the Dutch established the Dutch East Indies while the French created French Indochina. By the 19th century, all Southeast Asian countries were colonised except for Thailand. European commercial interests gradually evolved into annexation of territories. The Dutch moved into Indonesia, the British into Malaya and parts of Borneo, and the French into Indochina. During World War II, Imperial Japan invaded most former western colonies under the concept of Greater East Asia Co-Prosperity Sphere. The Shōwa occupation regime committed violent actions against civilians including live human experimentation. Sexual slavery occurred under the brutal comfort women system. The Manila massacre took place during this period. A system of forced labour involved four to ten million romusha in Indonesia. A UN report stated that four million people died in Indonesia as a result of famine and forced labour during Japanese occupation. The Allied powers defeated Japan in the South-East Asian theatre of World War II. Most of the region decolonised following the war's aftermath.

• 5. Modern Geopolitics

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  Eleven countries in the region are members of the Association of Southeast Asian Nations or ASEAN. This regional organisation was established for economic, political, military, educational, and cultural integration among its members. China has asserted broad claims over the South China Sea based on its nine-dash line. Artificial islands have been built in an attempt to bolster these claims. The Philippines challenged China in the Permanent Court of Arbitration in The Hague in 2013. In Philippines v. China (2016), the Court ruled in favour of the Philippines and rejected China's claims. Sovereignty issues exist over some islands in the South China Sea. Democratic forms of government are practised in most Southeast Asian countries today. Socialist or communist countries include Vietnam and Laos. Thailand remains the only country not colonised by European powers before independence. Papua New Guinea has stated it might join ASEAN and is currently an observer. Several countries of Maritime Southeast Asia are dialogue partners of the Pacific Islands Forum but hold no full membership. The boundary between Southeast Asia and Oceania lies geographically through Wallacea. Politically, the boundary exists between Papua New Guinea and Indonesian Western New Guinea.

• 6. Economic Engines

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  Even prior to European penetration, Southeast Asia was a critical part of the world trading system. Spices such as pepper, ginger, cloves, and nutmeg originated in the region. The spice trade initially developed by Indian and Arab merchants brought Europeans to the area. Rubber plantations were established in Malaysia, Java, Vietnam, and Cambodia in response to market demands. Tin mining occurred in Malaya while rice fields expanded in the Mekong Delta. Indonesia became the largest economy in the region by the early 21st century. It was classified as a newly industrialised country and is the region's singular member of the G-20 major economies. Indonesia's estimated gross domestic product for 2020 was US$1,088.8 billion nominal. Singapore leads the region with GDP per capita at US$84,500 nominal in 2023. Stock markets in Southeast Asia performed better than other bourses in the Asia-Pacific region in 2010. The Philippines' PSE led growth with 22 percent increase followed by Thailand's SET with 21 percent. Tourism has been a key factor in economic development for many countries especially Cambodia. By 2006, Cambodia generated almost 15% of its GDP from tourism.

• 7. Demographic Diversity

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  As of recent estimates, around million people live in the region with more than a fifth living on Java. Indonesia is the most populous country with approximately 270 million people representing about 40% of South East Asia. The peoples are mainly divided into four major ethnolinguistic groups: Austronesian, Austroasiatic, Tai, and Tibeto-Burman. The Negritos were among the earliest inhabitants genetically related to Papuans and Aboriginal Australians. In modern times, Javanese are the largest ethnic group with over 100 million people concentrated in Java. Vietnamese Kinh people form the second-largest group with around 86 million people. Thais are the third largest with around 59 million people forming the majority in Thailand. There are nearly 800 native languages spoken across the region. Indonesia has over 700 languages in over 17,000 islands making it the second most linguistically diverse country on Earth. Islam is the most practised faith with approximately 240 million adherents or about 40% of the entire population. Approximately 190, 205 million Buddhists reside in Southeast Asia making it the second-largest religion in the region. Christianity predominates in the Philippines which has the largest Roman Catholic population in Asia.