Indian Geography – Study Notes
(For NABARD Development Assistant – General Awareness & Current Affairs)
1. Simple Explanation
India is a vast, diverse country located in South Asia, bordered by the Indian Ocean to the south, the Arabian Sea to the west, and the Bay of Bengal to the east. Its geography is shaped by four major physical features:
| Feature | Key Traits | Main Examples |
|---|---|---|
| Mountain Ranges | Highest peaks, major watersheds | Himalayas (NW), Vindhya & Satpura (central), Eastern Ghats (east) |
| Plateaus | Elevated flatlands, fertile soil | Deccan Plateau (south), Central India Plain |
| Rivers | Lifelines for agriculture, trade | Ganga, Yamuna, Brahmaputra, Godavari, Krishna, Narmada |
| Coastlines & Islands | Maritime resources, ports | Arabian Sea, Bay of Bengal, Andaman & Nicobar, Lakshadweep |
These features influence climate, agriculture, settlement patterns, and economic activities across the country.
2. Key Points
A. Physical Regions
| Region | Location | Major Features | Climate | Economic Significance |
|---|---|---|---|---|
| Northern India | Himalayas & Indo-Gangetic plains | Highest peaks, fertile plains | Continental (cold winters, hot summers) | Agriculture (rice, wheat), tourism, hydroelectricity |
| Central India | Vindhya & Satpura, Chota Nagpur | Plateaus, hills | Tropical wet | Coal mining, agriculture (soyabean, cotton) |
| Eastern India | Brahmaputra & Ganges delta | Alluvial plains, deltas | Humid subtropical | Rice cultivation, fisheries |
| Western India | Western Ghats, Thar Desert | Mountain ranges, arid zones | Arid & semi-arid | Agriculture (citrus, spices), tourism |
| Southern India | Deccan Plateau, Eastern Ghats | Plateaus, coastal plains | Tropical monsoon | Agriculture (spices, coconut), ports |
| Island Territories | Andaman & Nicobar, Lakshadweep | Islands, coral reefs | Tropical monsoon | Fishing, tourism, strategic ports |
B. Major Rivers (Origin → Mouth)
| River | Length (km) | Origin | Key States Traversed | Mouth |
|---|---|---|---|---|
| Ganga | 2525 | Uttarakhand | UP, Bihar, Jharkhand | Bay of Bengal |
| Brahmaputra | 3800 | Bhutan | Assam, Arunachal | Bay of Bengal |
| Yamuna | 1515 | Uttarakhand | UP, Haryana | Ganga (confluence) |
| Godavari | 1455 | Maharashtra | Maharashtra, Telangana | Bay of Bengal |
| Krishna | 1444 | Maharashtra | Maharashtra, Karnataka | Bay of Bengal |
| Narmada | 1316 | Madhya Pradesh | MP, Gujarat | Arabian Sea |
| Tapti | 720 | Maharashtra | Maharashtra, Madhya | Arabian Sea |
C. Mountain Ranges & Peaks
| Range | Highest Peak | Elevation (m) | Provinces Covered |
|---|---|---|---|
| Himalayas | Kangchenjunga | 8,586 | Sikkim, Arunachal, West Bengal |
| Western Ghats | Doddabetta | 2,637 | Karnataka, Kerala |
| Eastern Ghats | Arma Konda | 1,455 | Andhra Pradesh, Odisha |
| Vindhya | – | – | Madhya Pradesh, Uttar Pradesh |
D. Climate Zones (Köppen Classification)
| Zone | Description | Typical Temperature | Rainfall (mm) | Main Crops |
|---|---|---|---|---|
| Tropical Rainforest | Equatorial | 27–32°C | 2000–4000 | Rubber, tea |
| Tropical Monsoon | Hot & humid | 25–35°C | 1500–3000 | Rice, sugarcane |
| Tropical Dry | Hot, seasonal rainfall | 25–35°C | 500–1500 | Millet, pulses |
| Temperate | Moderate | 10–25°C | 800–1500 | Wheat, millets |
| Cold | Alpine & Arctic | <10°C | 500–1500 | Barley, potatoes |
E. Important Economic Corridors
- Eastern Seaboard – Chennai, Kolkata, Visakhapatnam (shipping, ports).
- Northern Corridor – New Delhi to Kolkata (transport infrastructure).
- Western Corridor – Mumbai to Pune to Goa (industrial & tourism).
- Northeast Corridor – Siliguri to Guwahati (connectivity & trade).
3. Worked Example
Problem: India’s total land area is 3,287,263 km². The area covered by water (lakes, rivers, reservoirs) is approximately 1.27% of the land area. Calculate the area covered by water and verify that it matches the figure of ~41,000 km².
-
Compute 1.27% of 3,287,263 km²
[ \text{Water area} = 3,287,263 \times 0.0127 = 41,724 \text{ km}^2 ] -
Interpretation
- Roughly 41,700 km² of India’s land is covered by water.
- This includes major rivers, lakes (e.g., Dal Lake, Wular Lake), and reservoirs.
-
Cross‑check
- The figure 41,724 km² is close to the commonly cited “~41,000 km².”
- Difference due to rounding/variance in data sources.
Take‑away: Such calculations help in resource planning, flood management, and water‑resource policy discussions.
4. Quick Revision Summary
| Topic | Key Take‑away |
|---|---|
| Mountain Ranges | Himalayas → highest peaks & major watershed; Western/Eastern Ghats → biodiversity hotspots |
| Plateaus | Deccan Plateau → |