Indian Geography – Study Notes for JNU Entrance
General Awareness & Current Affairs
These notes are designed for quick, effective revision.
Use the Worked Example to practice calculations that often appear in entrance papers.
1. Simple Explanation
India is a sub‑continental landmass in South Asia, covering ~3.287 million km². It stretches from the Himalayas in the north to the Indian Ocean in the south, encompassing diverse physical and human geographies. The country’s geographic diversity shapes its climate, biodiversity, agriculture, culture, and economic activities.
Key take‑away: India’s geography is a mosaic of ranges, plains, plateaus, and coastlines that determine everything from climate patterns to language distribution.
2. Key Points
| Category | Details (as of 2024) |
|---|---|
| Physical Geography | • Mountain Ranges – Himalayas (NW), Vindhyas & Satpuras (central), Aravalli (central), Eastern Ghats (SE). • Plains – Indo‑Gangetic Plain (north), Deccan Plateau (central & south). • Plateaus – Deccan, Vindhya, Chota Nagpur. • Coastlines – 7,517 km (West & East). |
| Major Rivers | 1. Ganga (Jammu‑Kashmir to Bangladesh) 2. Yamuna 3. Brahmaputra 4. Narmada 5. Godavari 6. Krishna 7. Jhelum 8. Chenab 9. Sutlej 10. Suriname (not in India but part of “major rivers” script). Note: River catchment influences agriculture & irrigation. |
| Climate Zones | • Arid – Thar Desert (Rajasthan, Gujarat). • Semi‑Arid – Deccan Plateau. • Humid Subtropical – Indo‑Gangetic Plain. • Tropical Monsoon – South India. • Tropical Highland – Himalayas & Northeast. |
| Population | 1.428 billion (2024 estimate). Density: ~ 435 people/km². Major linguistic clusters: Indo‑Aryan (north), Dravidian (south), Tibeto‑Burmese (Northeast). |
| Major Cities | New Delhi (capital), Mumbai (financial hub), Bengaluru (IT), Hyderabad (tech), Chennai, Kolkata, Ahmedabad. |
| Natural Resources | Coal (Jharkhand, Chhattisgarh), Iron ore (Jharkhand), Bauxite (Odisha), Oil & gas (Gulf of Khambhat, Rajasthan), Forests (Sundarbans, Western Ghats). |
| Environmental Issues | Deforestation, water scarcity, Himalayan glacial melt, coastal erosion, air & water pollution. |
| Administrative Divisions | 28 states + 8 Union Territories. (New states: Uttarakhand, Chhattisgarh, etc., created since 2000.) |
3. Worked Example
Problem:
Calculate the population density of India (population = 1.428 billion; area = 3.287 million km²).
Solution:
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Convert data to consistent units
- Population = 1 428 × 10⁶ people
- Area = 3.287 × 10⁶ km²
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Apply formula
[ \text{Density} = \frac{\text{Population}}{\text{Area}} ][ \text{Density} = \frac{1,428,000,000}{3,287,000} \approx 435.3 \text{ people/km}^2 ]
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Interpretation
India’s density (~435 people/km²) is higher than the world average (~59 people/km²), indicating significant pressure on land and resources.
Quick Check:
- If you had to estimate on the spot, round population to 1.43 billion and area to 3.29 million:
[ \frac{1.43}{3.29}\times10^3 \approx 435 \text{ people/km}^2 ]
4. Quick Revision Summary
- Area: 3.287 million km² (largest in South Asia).
- Population: 1.428 billion → density ~ 435 people/km².
- Major Ranges: Himalayas, Vindhyas, Satpuras, Aravalli, Eastern Ghats.
- Major Plains: Indo‑Gangetic (north), Deccan Plateau (central