Geography of India

Overview

Geography of India is a high-weightage topic in KTET Category II/III Social Science, appearing consistently in 4-6 questions per exam. This topic tests your understanding of India's physical diversity—from the Himalayas to coastal plains—and how these features influence climate, drainage, and resource distribution.

For KTET, you must master the spatial relationships: why monsoons behave as they do, how river systems differ between the Himalayan and Peninsular regions, and where major mineral belts are located. Questions often integrate physical features with their economic significance, so rote memorisation alone won't suffice—you need to understand cause-effect relationships.

The Kerala connection matters here. Questions may link India's broader geography to Kerala's position on the Malabar Coast, Western Ghats influence, and southwest monsoon patterns. Think nationally but be ready for state-level applications.

Key Concepts

• **India's location**: Lies entirely in the Northern Hemisphere, between 8°4'N to 37°6'N latitude and 68°7'E to 97°25'E longitude. The Tropic of Cancer (23°30'N) divides India into almost two equal halves.

• **Six physiographic divisions**: The Himalayan Mountains, Northern Plains, Peninsular Plateau, Coastal Plains, Indian Desert, and Islands form distinct regions with unique characteristics.

• **Himalayan formation**: Result of collision between Indian Plate and Eurasian Plate during Tertiary period. Young fold mountains, still rising, highly prone to earthquakes.

• **Monsoon mechanism**: Differential heating of land and sea causes pressure differences. Southwest monsoon (June-September) brings 75% of India's rainfall; northeast monsoon affects Tamil Nadu and Kerala.

• **Two river systems**: Himalayan rivers are perennial (snow-fed + rain-fed), while Peninsular rivers are seasonal (rain-fed only). This fundamental difference affects irrigation potential.

• **India's mineral belts**: The Chotanagpur Plateau (Jharkhand-Odisha-Chhattisgarh) is India's mineral heartland, containing iron ore, coal, manganese, and mica deposits.

• **Western Ghats significance**: Older than Himalayas, UNESCO biodiversity hotspot, source of all major Peninsular rivers flowing eastward, and crucial for southwest monsoon rainfall on western coast including Kerala.

Formulas / Key Facts

| Feature | Key Details | |---------|-------------| | Total area | 32.87 lakh sq km (7th largest country) | | Coastline length | 7,516.6 km (mainland: 6,100 km) | | Highest peak | K2/Godwin Austen (8,611 m) in PoK; Kanchenjunga (8,586 m) in India | | Longest river | Ganga (2,525 km); Godavari is longest Peninsular river (1,465 km) | | Largest state by area | Rajasthan (342,239 sq km) | | Annual rainfall range | 100 mm (Leh) to 11,000+ mm (Mawsynram, Meghalaya) | | Standard Meridian | 82°30'E (passes through Mirzapur, UP) | | Major soil types | Alluvial (most fertile, Northern Plains), Black/Regur (Deccan, cotton), Laterite (Kerala, Western Ghats), Red (Peninsular) |