GS-1 · Physical & Political · UPSC Civil Services
Geography of India
Physical features, rivers and lakes, monsoon and soils, minerals and resources, and political geography — one of the highest-weightage UPSC Prelims subjects, in one reference.
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3,287,263 sq km
7 land borders
28 States · 8 UTs
PYQ Tagged
India covers 3,287,263 sq km — the 7th largest country in the world. It stretches 3,214 km north to south and 2,933 km east to west.
Physiographic Divisions
🏔️ The Himalayan Mountains
- Youngest fold mountains, formed ~50 million years ago
- Three parallel ranges: Greater, Lesser and Outer (Shivalik) Himalayas
- Highest peak in India: Kangchenjunga (8,586 m), Sikkim
- Source of the Indus, Ganga and Brahmaputra river systems
🌾 The Northern Plains
- Formed by alluvial deposits of the Indus, Ganga and Brahmaputra
- Stretches ~2,400 km; most densely populated and agriculturally productive region
- Divided into Bhabar, Terai, Bhangar and Khadar zones
🪨 The Peninsular Plateau
- Oldest and most stable landmass — part of Gondwana
- Deccan Plateau lies between the Western & Eastern Ghats
- Western Ghats' highest point: Anamudi (2,695 m), Kerala
🏜️ The Thar Desert
- Rajasthan and parts of Gujarat, Punjab, Haryana
- ~2,08,000 sq km — 17th largest desert in the world
- Luni is the only significant river in the region
🌊 Coastal Plains
- Western Coastal Plain: narrow (10–25 km), Konkan, Malabar coast
- Eastern Coastal Plain: broader (100–130 km), Coromandel coast
- Chilika Lake (Odisha) — largest coastal lagoon in India
🏝️ Islands
- Andaman & Nicobar: 572 islands; Barren Island — only active volcano in South Asia
- Lakshadweep: 36 coral islands, only 10 inhabited
Sources: NCERT Class 11 — India: Physical Environment · Survey of India · Ministry of Earth Sciences
India has one of the world's most extensive river systems — Himalayan (perennial) and Peninsular (seasonal).
Major River Systems
| River | Origin | Drains Into | Key Tributaries |
|---|---|---|---|
| Indus | Mansarovar (Tibet) | Arabian Sea | Jhelum, Chenab, Ravi, Beas, Sutlej |
| Ganga | Gangotri Glacier | Bay of Bengal | Yamuna, Ghaghra, Gandak, Kosi, Son |
| Brahmaputra | Chemayungdung Glacier (as Tsangpo) | Bay of Bengal | Dibang, Lohit, Subansiri, Teesta |
| Godavari | Trimbakeshwar, Maharashtra | Bay of Bengal | Penganga, Wardha, Indravati |
| Krishna | Western Ghats, Maharashtra | Bay of Bengal | Tungabhadra, Bhima, Musi |
| Narmada | Amarkantak, MP | Arabian Sea | Tawa, Hiran, Burhner |
| Mahanadi | Chhattisgarh | Bay of Bengal | Sheonath, Jonk, Hasdeo |
Important Lakes
| Lake | State | Type | Significance |
|---|---|---|---|
| Wular Lake | J&K | Freshwater | Largest freshwater lake in India |
| Chilika Lake | Odisha | Brackish (lagoon) | Largest coastal wetland; Ramsar site |
| Sambhar Lake | Rajasthan | Saline | Largest inland salt lake; Ramsar site |
| Vembanad Lake | Kerala | Brackish (backwater) | Longest lake in India |
| Loktak Lake | Manipur | Freshwater | Largest freshwater lake in NE India; floating phumdis |
| Pangong Tso | Ladakh | Saline (endorheic) | Extends into China; ~4,350 m altitude |
Sources: NCERT Class 11 — India: Physical Environment · Central Water Commission
India has a monsoon-dominated climate. The SW Monsoon (June–September) accounts for 75–90% of annual rainfall in most of India.
Climate Types (Köppen Classification)
| Climate Type | Region | Characteristics |
|---|---|---|
| Tropical Wet (Am) | Western coastal plains, NE India | Mawsynram (Meghalaya) — wettest place on Earth |
| Semi-Arid (BSh) | Deccan Plateau, parts of Rajasthan | Low rainfall, high temperatures |
| Arid (BWh) | Thar Desert, western Rajasthan | <250 mm rain, extreme temperatures |
| Alpine/Tundra (ET) | High Himalayas, Ladakh | Cold desert; permafrost |
Monsoon Mechanism
☀️ SW Monsoon (June–Sep)
- Onset at Kerala coast around 1 June
- Two branches — Arabian Sea and Bay of Bengal
- Withdraws fully by December
🌧️ NE Monsoon (Oct–Dec)
- Also called the Retreating Monsoon
- Brings rain to Tamil Nadu and SE India
- Associated with Bay of Bengal cyclones
❄️ Western Disturbances
- Extratropical cyclones from the Mediterranean
- Bring winter rainfall to NW India
- Important for rabi crop irrigation
Soil Types of India
| Soil Type | States | Crops | Key Feature |
|---|---|---|---|
| Alluvial Soil | Northern Plains, river deltas | Wheat, rice, sugarcane | Most fertile; covers 43% of India's land area |
| Black Soil (Regur) | Maharashtra, MP, Gujarat | Cotton, sorghum | Formed from Deccan trap lava; retains moisture |
| Red & Yellow Soil | Peninsular plateau, Odisha | Groundnut, millets | Iron oxide colour; leached; low fertility |
| Laterite Soil | Kerala, Karnataka, Assam | Tea, coffee, rubber | High temperature & rainfall; heavily leached |
Sources: NCERT Class 11 — India: Physical Environment; ICAR; IMD
India is rich in mineral resources. The Chhota Nagpur region is the “mineral heartland” of India — home to coal, iron ore, manganese and bauxite.
Key Minerals and Producing States
| Mineral | Top Producing States | Key Mines / Regions |
|---|---|---|
| Coal | Jharkhand, Odisha, Chhattisgarh | Jharia, Raniganj, Singrauli |
| Iron Ore | Odisha, Chhattisgarh, Karnataka | Bailadila, Kudremukh |
| Bauxite | Odisha, Gujarat, Jharkhand | Panchpatmali (Odisha) |
| Petroleum | Gujarat, Assam, Rajasthan (offshore Mumbai High) | Digboi — Asia's oldest oil refinery |
| Uranium | Jharkhand, Rajasthan, AP | Jaduguda — India's first uranium mine |
| Thorium | Kerala, Tamil Nadu (beach sands) | Monazite sands — world's largest reserves |
Energy Resources
☀️ Renewable Energy
- Solar: Bhadla Solar Park (Rajasthan) — world's largest
- Wind: Muppandal (Tamil Nadu) — largest wind farm cluster
- Target: 500 GW renewable capacity by 2030
⚡ Major Dams
- Tehri Dam (Uttarakhand) — India's tallest dam (260.5 m)
- Bhakra Nangal — tallest concrete gravity dam in Asia
- Hirakud (Odisha) — longest earthen dam in India
Sources: Geological Survey of India · Ministry of Mines · MNRE
India is a federal union of 28 States and 8 Union Territories, sharing land borders with 7 countries and a maritime boundary with Sri Lanka and the Maldives.
International Boundaries
| Country | Border Name | Length (approx.) |
|---|---|---|
| Bangladesh | — | 4,156 km |
| China | Line of Actual Control / McMahon Line | 3,488 km |
| Pakistan | Radcliffe Line; Line of Control in J&K | 3,323 km |
| Nepal | — | 1,751 km |
| Myanmar | — | 1,643 km |
| Bhutan | — | 699 km |
Key Geographic Facts
📍 Extremes of India
- Southernmost: Indira Point, Great Nicobar Island
- Mainland southernmost: Kanyakumari, Tamil Nadu
- Westernmost: Sir Creek area, Gujarat
🏙️ Largest & Smallest
- Largest state by area: Rajasthan
- Smallest state by area: Goa
- Newest states: Telangana (2014)
🗺️ Standard Meridian & Time
- Standard Meridian: 82°30'E (IST = UTC+5:30)
- Tropic of Cancer passes through 8 states
Sources: Survey of India · Ministry of External Affairs · Census of India 2011