Asia is the world’s largest and most populous continent, covering approximately 30% of Earth’s land area and 8.7% of its total surface area. Strategically located primarily in the Eastern and Northern Hemispheres, it is a region of extreme geographical and socio-economic contrasts, hosting the highest point (Mount Everest) and the lowest point (Dead Sea) on Earth.
Political Geography and Regional Divisions
Asia is conventionally divided into five major sub-regions based on geographic and cultural proximity. As of 2026, there are 48 UN-recognized countries, along with several disputed territories and transcontinental nations.
Central Asia
Comprising five landlocked former Soviet republics, this region is vital for India’s “Connect Central Asia” policy and energy security.
- Countries: Kazakhstan (Astana), Kyrgyzstan (Bishkek), Tajikistan (Dushanbe), Turkmenistan (Ashgabat), Uzbekistan (Tashkent).
- Key Fact: Kazakhstan is the world’s largest landlocked country.
East Asia
This region is the economic powerhouse of the continent, featuring high industrialization and significant geopolitical friction.
- Countries: China (Beijing), Japan (Tokyo), South Korea (Seoul), North Korea (Pyongyang), Mongolia (Ulaanbaatar), and Taiwan (Taipei – disputed).
- Key Fact: The region contains three of the world’s top 10 largest economies (China, Japan, South Korea).
South Asia
Home to nearly one-fourth of the global population, this region is central to India’s immediate neighborhood policy (Neighborhood First).
- Countries: India (New Delhi), Pakistan (Islamabad), Bangladesh (Dhaka), Sri Lanka (Sri Jayawardenepura Kotte), Nepal (Kathmandu), Bhutan (Thimphu), Maldives (Malé), Afghanistan (Kabul).
- Key Fact: This is the world’s most densely populated sub-region.
Southeast Asia
Situated between the Indian and Pacific Oceans, this region is a focal point for India’s “Act East Policy.”
- Countries: Indonesia (Jakarta), Vietnam (Hanoi), Thailand (Bangkok), Philippines (Manila), Malaysia (Kuala Lumpur), Singapore (Singapore), Myanmar (Naypyidaw), Cambodia (Phnom Penh), Laos (Vientiane), Brunei (Bandar Seri Begawan), Timor-Leste (Dili).
- Key Fact: Indonesia is the world’s largest archipelagic state.
West Asia (Middle East)
A region of immense strategic importance due to its vast hydrocarbon reserves and critical maritime choke points.
- Key Countries: Saudi Arabia (Riyadh), Iran (Tehran), Iraq (Baghdad), UAE (Abu Dhabi), Israel (Jerusalem), Turkey (Ankara), Qatar (Doha), Oman (Muscat).
- Transcontinental Note: Turkey and Russia are transcontinental, with landmasses extending into Europe.
Physical Geography: Major Landmarks
Asia’s physical landscape is dominated by massive mountain “knots,” vast plateaus, and extensive river systems that support civilizations.
| Feature Type | Notable Examples | Significance |
| Mountain Knots | Pamir Knot, Armenian Knot | Known as the “Roof of the World”; junction of the Himalayas, Karakoram, and Hindu Kush. |
| Highest Peaks | Mt. Everest (8,848m), K2 (8,611m) | Crucial for understanding tectonic plate movements (Indo-Australian vs. Eurasian). |
| Major Plateaus | Tibetan Plateau, Deccan Plateau | Tibet is the source of major rivers like the Indus, Brahmaputra, and Yangtze. |
| Deserts | Gobi (Cold), Arabian (Hot), Thar | Gobi is a rain-shadow desert; Arabian is the world’s largest continuous sand desert. |
| Lakes | Caspian Sea, Lake Baikal | Caspian is the world’s largest inland water body; Baikal is the deepest freshwater lake. |
Major River Systems of Asia
Rivers in Asia are categorized by the oceans they drain into. This drainage pattern is a frequent topic in Prelims.
Arctic Ocean Drainage
- Rivers: Ob, Yenisey, Lena.
- Fact: These rivers flow northward and remain frozen for a significant part of the year.
Pacific Ocean Drainage
- Rivers: Yangtze (Longest in Asia), Huang He (Yellow River), Amur, Mekong.
- Fact: The Yangtze is the third longest river in the world (approx. 6,300 km).
Indian Ocean Drainage
- Rivers: Indus, Ganga, Brahmaputra, Irrawaddy, Salween, Tigris-Euphrates.
- Fact: These rivers support the most fertile agricultural plains on the planet.
Strategic Maritime Choke Points
Asia controls several maritime passages that are vital for global trade and energy transit.
- Strait of Malacca: Connects the Indian Ocean to the South China Sea; handles 25% of global sea trade.
- Strait of Hormuz: Connects the Persian Gulf to the Gulf of Oman; world’s most important oil transit point.
- Bab-el-Mandeb: Connects the Red Sea to the Gulf of Aden; critical for trade via the Suez Canal.
- Sunda Strait: Connects the Java Sea to the Indian Ocean; an alternative to Malacca.
Regional Organizations and Groupings
Asia is a hub for multilateralism, with India playing a leading role in several key organizations.
- ASEAN (1967): 10 Southeast Asian nations; India is a key dialogue partner.
- SAARC (1985): 8 South Asian nations; headquartered in Kathmandu.
- BIMSTEC (1997): Bridges South and Southeast Asia; focuses on the Bay of Bengal region.
- SCO (2001): Focuses on Eurasian security; India and Pakistan became full members in 2017.
- GCC (1981): A political and economic union of six Arab states in the Persian Gulf.
Trivia and Quick Facts for UPSC Prelims
- Smallest Country: Maldives (by both area and population).
- Most Populous: India (surpassed China in 2023).
- Longest Coastline: Indonesia (among Asian countries).
- Highest Rainfall: Mawsynram, India (highest average annual rainfall in the world).
- Deepest Point: Mariana Trench (Pacific Ocean, near the Philippines).
- Lowest Point: Dead Sea (bordered by Jordan and Israel, 430m below sea level).