Indian Geography – Comprehensive Study Notes
(For Ladakh PSC – General Awareness & Current Affairs)
Aim: Build a solid, exam‑ready understanding of India’s physical, human, and economic geography.
Scope: All 28 states & 8 Union Territories, major physical features, climate zones, demographics, economic sectors, environmental issues, and recent developments (2024‑25).
1. Physical Geography
| Feature | Key Facts | Trivia / Trick Points |
|---|---|---|
| Topography | • 3 million km² land area. • Highest point: K2 (8 611 m) – Ladakh. • Lowest point: Rann of Kutch (−28 m). |
• “India is 2/3 land, 1/3 water” – 1.3 million km² water bodies. |
| Mountain Ranges | • Hindukush, Himalaya, Satpura, Vindhya, Aravalli, Arakan, Eastern Ghats. | • Aravalli is the world’s oldest mountain range (~2 billion years). |
| Plateau & Plains | • Indo-Gangetic Plain (45 % of land). • Deccan Plateau (28 %); 3 parts – Central, Eastern, Western. |
• The “Chari‑Sagar” is the longest river in the Deccan. |
| Rivers | • 8 major rivers: Ganga, Yamuna, Brahmaputra, Indus, Godavari, Krishna, Narmada, Tapti. • River Ganga length: 2 525 km (2 388 km in India). |
• River Brahmaputra joins the Ganga at Patalpani in Madhya Pradesh. |
| Basins | • 5 major river basins: Ganga, Indus, Brahmaputra, Godavari, Krishna. | • “Mahanadi” is the only river that flows entirely in one state (Odisha). |
| Coastline | • 7 516 km total. • 4 141 km on the Arabian Sea. • 3 375 km on the Bay of Bengal. |
• “Saurashtra” has the longest coastline in India (1 045 km). |
| Climate | • 6 eco‑zones: Alpine, Cold Desert, Humid Tropical, Semi‑Arid, Arid, Temperate. • Köppen classification used for Indian climate mapping. |
• “Kharif” rains are part of the South‑Asian monsoon (June–Sept). |
| Natural Disasters | • Earthquakes (e.g., 2001 Gujarat, 2015 Nepal‑India). • Floods (e.g., 2019 Assam floods). • Droughts (e.g., 2023–24 in Rajasthan). |
• “Landslide” frequency is highest in Himalayan belt (> 1 000 per year). |
2. Human Geography
2.1 Population & Demography
| Metric | 2011 Census | 2024‑25 Estimate |
|---|---|---|
| Total Population | 1 210 000 000 | ~1 400 000 000 |
| Population Density | 382 people/km² | 503 people/km² |
| Urbanization | 31 % | 37 % |
| Literacy | 74.04 % | 80 % |
| Sex Ratio | 940 females/1000 males | 950 |
Important Formulae
| Formula | Meaning | Example |
|---|---|---|
| Population Density (D = \frac{P}{A}) | People per km² | (D = \frac{1,400,000,000}{3,287,263} \approx 426) |
| Growth Rate (r = \frac{P_t - P_{t-1}}{P_{t-1}}) | Annual growth | If 2011‑2021 growth = 1 %/yr |
| Urban‑Rural Ratio (U:R) | Ratio of urban to rural population | 1 : 2.5 (for 2024) |
Tricky Points
- Census vs. Projection: Census data lag; projections use the above growth rate.
- ”Population in transit” (e.g., migrant workers) is excluded from resident population but affects local resources.
- “Rural‑urban migration” is often cited in policy but must be distinguished from “permanent settlement”.
2.2 Ethnicity & Language
| Category | Key Data |
|---|---|
| Official Language | 22 languages (Hindi, English + 20 scheduled). |
| Mother Tongue | 7 % speak only Hindi; 30 % speak regional languages. |
| Minority Communities | Muslims 14.2 %; Sikhs 1.7 %; Christians 2.3 %; Others 0.3 %. |
| Linguistic Map | “Kashmiri” and “Dogri” in Jammu & Kashmir; “Sanskrit” in Uttarakhand. |
Tricky Points
- “Scheduled Languages” differ from “Official Languages”; both are used in education & administration.
- “Adivasi” populations concentrate in Northeast and central states.
2.3 Economic Geography
| Sector | 2023‑24 Contribution | Key States |
|---|---|---|
| Agriculture | 17 % of GDP | Punjab, Haryana, Uttar |