Indian Geography – AFCAT General Awareness & Current Affairs
Why it matters
AFCAT tests a candidate’s knowledge of Indian geography to gauge awareness of the country’s socio‑economic landscape, strategic regions, and environmental issues.
1. Simple Explanation
India is a sub‑continental country in South Asia.
- Area: 3.28 million km² (4th largest in the world).
- Borders: 14 000 km of land borders (with Pakistan, China, Nepal, Bhutan, Bangladesh, Myanmar) + 10 000 km of coastline.
- Topography: Five main physiographic zones – Himalayan Range, Indo‑Gangetic Plain, Deccan Plateau, Thar Desert, and the coastal plains.
- Climate: Ranges from tundra in the north‑east to tropical in the south, with monsoon (June‑September) dictating most agriculture.
2. Key Points
| Category | Detail |
|---|---|
| States & Union Territories (UTs) | 28 States + 8 UTs (as of 2024) |
| Largest State (area) | Rajasthan – 342,239 km² |
| Smallest State (area) | Goa – 3,285 km² |
| Largest UT (area) | Ladakh – 59,146 km² |
| Smallest UT (area) | Puducherry – 442 km² |
| Capital cities | 28 State capitals + 8 UT capitals |
| Major Rivers | Ganga, Brahmaputra, Indus, Godavari, Krishna, Narmada, Yamuna, Mahanadi, etc. |
| Mountain Ranges | Himalayas (NW), Satpura, Vindhya, Aravalli, Western Ghats |
| Deserts | Thar (Rajasthan), Bikaner, Kutch |
| Coastline length | ~7,500 km (India has the 3rd longest coastline). |
| Population (2023 estimate) | ~1.41 billion |
| Population density | ~420 persons/km² (overall) |
| Major climate zones | Tropical (South), Subtropical (Central & South), Temperate (North), Tundra (North‑East) |
| Important ecological zones | Sundarbans (delta), Western Ghats, Eastern Ghats, Himalayan biodiversity hotspots |
2.1. Physiographic Zones (Quick Reference)
| Zone | Main Features | Representative State(s) |
|---|---|---|
| Himalayan Range | Highest peaks, glaciers, river source | Jammu & Kashmir, Himachal Pradesh, Uttarakhand, Sikkim, Arunachal Pradesh |
| Indo‑Gangetic Plain | Alluvial plains, fertile | UP, Bihar, West Bengal, Assam, Punjab, Haryana |
| Deccan Plateau | Arid to semi‑arid, plateau | Maharashtra, Karnataka, Telangana, Andhra Pradesh, Tamil Nadu |
| Thar Desert | Sand dunes, sparse vegetation | Rajasthan, Gujarat |
| Coastal Plains | Mangroves, deltaic plains | Kerala, Tamil Nadu, Odisha, West Bengal, Gujarat |
2.2. Major Rivers & Their States
| River | Length (km) | States it flows through |
|---|---|---|
| Ganga | 2,525 | Uttarakhand, Haryana, UP, Bihar, West Bengal |
| Brahmaputra | 2,900 | Assam, Arunachal Pradesh |
| Indus | 3,180 | Punjab, Sindh (Pakistan) – Note: Indus does not flow in India |
| Yamuna | 1,376 | Uttarakhand, Haryana, UP |
| Godavari | 1,465 | Maharashtra, Telangana, Andhra Pradesh, Karnataka |
| Krishna | 1,400 | Maharashtra, Karnataka, Telangana, Andhra Pradesh |
| Narmada | 1,312 | Madhya Pradesh, Maharashtra |
| Mahanadi | 1,435 | Chhattisgarh, Odisha, Jharkhand |
3. Worked Example
Problem:
Calculate the population density of Karnataka (2023 estimate) and compare it with the national average.
Given (2023 estimates):
- Population of Karnataka ≈ 68.8 million
- Area of Karnataka ≈ 191,791 km²
- National population ≈ 1.41 billion
- National area ≈ 3.28 million km²
Solution:
-
Population density of Karnataka
[ \text{Density} = \frac{\text{Population}}{\text{Area}} = \frac{68.8 \times 10^6}{191,791} \approx 359 \text{ persons/km}^2 ] -
National population density
[ \frac{1.41 \times 10^9}{3.28 \times 10^6} \approx 430 \text{ persons/km}^2 ] -
Comparison
- Karnataka’s density (359 / km²) is lower than the national average (430 / km²) by about 71 persons/km² (