Physical Geography of India

Overview

Physical Geography of India is a foundational topic for WB TET Paper II Social Studies. It covers the structural framework of the Indian subcontinent — the mountains that guard it, the plains that feed it, the rivers that sustain it, and the climate and vegetation that define its ecological diversity. Questions typically test factual recall (names, locations, heights, lengths) and the ability to connect physical features with human activities like agriculture, settlement and transportation.

For the TET exam, you must know the major physiographic divisions, the course and tributaries of principal rivers, the mechanism of the Indian monsoon, and the distribution of natural vegetation types. Map-based mental images are essential — examiners often ask "which state" or "which direction" questions that require spatial awareness.

Key Concepts

• **Six Major Physiographic Divisions**: India is divided into the Himalayan Mountains, Northern Plains, Peninsular Plateau, Indian Desert, Coastal Plains and Islands. Each has distinct geological origin and landforms.

• **Himalayan Zones**: The Himalayas run west to east and comprise three parallel ranges — the Greater Himalayas (Himadri), Lesser Himalayas (Himachal) and Outer Himalayas (Shiwaliks). Important passes include Khyber, Bolan, Shipki La and Nathu La.

• **Northern Plains Formation**: Formed by alluvial deposits of the Indus, Ganga and Brahmaputra river systems. Sub-divisions are Bhabar (pebble zone), Terai (marshy), Bhangar (old alluvium) and Khadar (new alluvium).

• **Peninsular Plateau Characteristics**: One of the oldest landmasses, made of igneous and metamorphic rocks. Divided into the Central Highlands (north of Narmada) and the Deccan Plateau (south of Narmada). The Western Ghats are higher and continuous; Eastern Ghats are broken and lower.

• **Drainage Systems**: Himalayan rivers are perennial (snow-fed); Peninsular rivers are seasonal (rain-fed). West-flowing rivers (Narmada, Tapi) form estuaries; east-flowing rivers (Godavari, Krishna, Kaveri) form deltas.

• **Monsoon Mechanism**: India's climate is dominated by the south-west monsoon (June–September) bringing 75% of annual rainfall, and the retreating north-east monsoon (October–December) important for Tamil Nadu.

• **Natural Vegetation Zones**: Distributed based on rainfall and temperature — Tropical Evergreen (>200 cm rain), Tropical Deciduous (75–200 cm), Thorn Forests (<75 cm), Montane Forests (altitude-based) and Mangroves (tidal areas).

Key Facts

| Category | Must-Remember Facts | |----------|---------------------| | Highest Peak | K2 (Godwin Austen) — 8611 m (in India-administered region); Kanchenjunga — 8586 m (entirely within India) | | Longest River | Ganga — 2525 km | | Largest River by Discharge | Brahmaputra | | Highest Plateau | Ladakh Plateau (average 5000 m) | | Largest Peninsular River | Godavari — 1465 km ("Dakshin Ganga") | | Western Ghats Highest Peak | Anai Mudi — 2695 m (Kerala) | | Eastern Ghats Highest Peak | Mahendragiri — 1501 m (Odisha) | | Monsoon Arrival | Kerala coast — 1st June (normal date) | | Sundarbans Location | Ganga-Brahmaputra delta, West Bengal — largest mangrove forest in the world | | Rain-Shadow Region | Eastern slopes of Western Ghats (e.g., interior Karnataka, western Tamil Nadu) |