South, East, and Southeast Asia: Countries, Capitals, and Geographic Structure
This large region becomes manageable by separating South Asia’s mountain rim and river plains, East Asia’s continental interior and Pacific coast, mainland Southeast Asia’s river corridors, and maritime Southeast Asia’s archipelagos and straits. That organization explains more than an undifferentiated “Asia” list.
Big idea: Large mountain systems and seas create constraints, but they are not walls that make contact impossible. Himalayan passes, Indian Ocean trade, and river valleys have connected societies as well as separated them.
Four structures to learn first
- South Asian drainage: Pakistan contains much of the lower Indus system. Northern India and Bangladesh connect through the Ganges–Brahmaputra–Meghna system. Nepal and Bhutan lie in the Himalayan belt between India and China. Sri Lanka is an island off India; Maldives is an atoll chain farther southwest.
- East Asian rim: Mongolia is between Russia and China, with no coast. The Korean Peninsula projects between China and Japan. Japan is an island arc, not a southern extension of the Korean landmass. Taiwan lies across the Taiwan Strait from southeastern China and receives separate status treatment below.
- Mainland Southeast Asia: Myanmar faces the Bay of Bengal and Andaman Sea. Thailand occupies a central position; landlocked Laos lies beside the Mekong; Cambodia contains the lower Mekong/Tonle Sap system; Vietnam runs along the eastern coast. These waterways cross political boundaries and connect upstream decisions to downstream effects.
- Maritime Southeast Asia: Malaysia has peninsular and Bornean regions. Indonesia spans a vast archipelago and shares Borneo with Malaysia and Brunei, New Guinea with Papua New Guinea, and Timor with Timor-Leste. The Philippines lies farther northeast. Singapore is positioned beside the shipping route around the Malay Peninsula’s southern tip.
Malaysia and Indonesia are particularly useful counterexamples to the assumption that a country is a single continuous patch of land. A state can be politically unified while its regions are separated by sea and connected through ports, aviation and administrative networks.
Country reference: 24 baseline entries
Reference checked: 11 October 2026. Follow a country name for its UN Statistics Division profile (2025 baseline). Letter-number markers lead to the exceptions below; later official evidence overrides older profile labels. This is a location guide, not an exhaustive boundary inventory. Use the world reference hub for the inclusion rule and a published map companion.
South Asia
| Country | Capital / government-center reference | Where to put it on the map |
|---|---|---|
| Afghanistan | Kabul | Landlocked crossroads south of Central Asia; between Iran, Pakistan and a short Chinese border. |
| Pakistan | Islamabad | Indus basin; Arabian Sea coast; between Iran/Afghanistan and India [S1]. |
| India | New Delhi | South Asian peninsula between Arabian Sea and Bay of Bengal; Himalayas to north [S1]. |
| Nepal | Kathmandu | Landlocked Himalayan country between India and China. |
| Bhutan | Thimphu | Landlocked eastern Himalayas between India and China, east of Nepal. |
| Bangladesh | Dhaka | Ganges–Brahmaputra–Meghna delta at Bay of Bengal; mostly surrounded by India. |
| Sri Lanka | Sri Jayewardenepura Kotte [S2] | Island southeast of India across Palk Strait; capital within Colombo metropolitan area. |
| Maldives | Malé | Indian Ocean coral atolls southwest of India and Sri Lanka. |
East Asia
| Country | Capital / government-center reference | Where to put it on the map |
|---|---|---|
| China | Beijing [S3] | From Central Asian interior and Tibetan Plateau to Pacific-facing plains; Korea lies northeast. |
| Mongolia | Ulaanbaatar | Landlocked between Russia and China; steppe and Gobi Desert. |
| North Korea | Pyongyang | Northern Korean Peninsula; borders China, Russia and South Korea. |
| South Korea | Seoul [S4] | Southern Korean Peninsula; across Korea Strait from Japan. |
| Japan | Tokyo | Pacific island arc east of Korea and China; principal islands run northeast–southwest. |
Mainland Southeast Asia
| Country | Capital / government-center reference | Where to put it on the map |
|---|---|---|
| Myanmar | Nay Pyi Taw | Bay of Bengal/Andaman Sea coast; between India/Bangladesh and Thailand/China/Laos. |
| Thailand | Bangkok | Central mainland Southeast Asia; narrows southward onto Malay Peninsula. |
| Laos | Vientiane | Landlocked; Mekong corridor between Thailand and Vietnam; China to north. |
| Cambodia | Phnom Penh | Lower Mekong basin; between Thailand, Laos and Vietnam; Gulf of Thailand coast. |
| Vietnam | Hanoi | Long eastern mainland coastline; Red River delta north and Mekong delta south. |
Maritime Southeast Asia
| Country | Capital / government-center reference | Where to put it on the map |
|---|---|---|
| Malaysia | Kuala Lumpur [S5] | Two main regions: southern Malay Peninsula and northern Borneo, separated by South China Sea. |
| Singapore | Singapore | Island city-state at southern end of Malay Peninsula beside major maritime straits. |
| Brunei | Bandar Seri Begawan | Two separated sections on northern Borneo, surrounded on land by Malaysia. |
| Indonesia | Jakarta; Nusantara transition [S6] | Archipelago between Indian and Pacific oceans; includes western New Guinea and southern Borneo. |
| Philippines | Manila | Archipelago east of Vietnam and north of Indonesia; Luzon north, Mindanao south. |
| Timor-Leste | Dili | Eastern Timor plus Oecusse exclave and islands; land boundary with Indonesia. |
Capital and status notes
- S1 — Kashmir and Himalayan borders: India, Pakistan and China have overlapping territorial claims and differing areas of control in the Kashmir region; other Himalayan boundary disputes also remain. The orientation cues are not a boundary adjudication or a complete list of claims.
- S2 — Sri Lanka: Sri Jayewardenepura Kotte is the administrative/legislative capital described by its municipal government and houses Parliament. Colombo is the commercial center and retains important government institutions. The UN’s 2025 profile calls Colombo the capital and Kotte the legislative capital; this difference in terminology is preserved rather than hidden behind one supposedly universal answer. Kotte municipal government, UN profile
- S3 — China/Taiwan: The baseline China row is the People’s Republic of China, whose capital is Beijing. Taiwan is governed separately from Taipei and claimed by the PRC; it is not a UN member. Hong Kong and Macao are special administrative regions of the PRC, not additional sovereign-state rows. See the status guide.
- S4 — South Korea: Seoul is the capital. Sejong houses many ministries and administrative functions; administrative decentralization does not by itself replace the capital. UN profile
- S5 — Malaysia: Kuala Lumpur is the capital; Putrajaya is the federal administrative center. UN profile
- S6 — Indonesia: Jakarta remains the capital under the transition rule described by the Constitutional Court on 12 May 2026, pending the presidential decree transferring capital functions to Nusantara. Nusantara, in East Kalimantan on Borneo, is the planned/new capital under development; official planning targets political-capital operation in 2028. This reference does not equate the project’s designation, partial occupation and completed legal/administrative transfer. No later effective transfer decree was verified for this edition. Constitutional Court, Nusantara Capital Authority
Worked example: why Bangladesh is not “east of India” in a simple way
Bangladesh sits beside India’s northeastern states, while most of India’s territory lies to its west. A narrow Indian corridor north of Bangladesh connects those northeastern states to the rest of India. The coastline is to Bangladesh’s south; Myanmar meets its southeast. This is a much better orientation than picturing India and Bangladesh as two rectangles side by side.
The geography also makes the historical sequence memorable: Bangladesh was East Pakistan before independence in 1971, separated from West Pakistan by Indian territory. Distance, unequal political power, language and military repression all matter to the explanation; geographical separation alone did not make the outcome inevitable. Follow South Asian partition and Bangladesh.
Recall check: Name the three states sharing Borneo, then distinguish them from the two sharing New Guinea and the two sharing Timor. That exercise tests the relation between islands and political units, not merely a list of capitals.