Physical Features of India
India: A Land of Diversity
India occupies the Indian subcontinent, covering approximately 3.28 million sq km — the 7th largest country in the world and the 2nd most populous (after China as of recent census data). It lies entirely in the Northern Hemisphere, between 8°4’N and 37°6’N latitude and 68°7’E and 97°25’E longitude. The Tropic of Cancer (23°30’N) divides India into roughly equal halves.
Physical Divisions of India
1. The Himalayan Mountains
The Himalayas form the northern boundary of India, stretching 2,500 km from the Indus to the Brahmaputra. They were formed by the collision of the Indian plate with the Eurasian plate (still ongoing — this is why earthquakes are common in North India).
Three Parallel Ranges of the Himalayas (from south to north):
| Range | Also Known As | Key Features |
|---|---|---|
| Greater Himalayas (Himadri) | High Himalayas | Highest peaks — including Mt. Everest (8,849m, Nepal), K2; permanent snow |
| Lesser Himalayas (Himachal) | Middle Himalayas | 2,000–3,000 m elevation; popular hill stations (Shimla, Mussoorie) |
| Shivalik Hills (Outer Himalayas) | Sub-Himalayas | Lowest, outermost range; composed of young, soft rock |
Trans-Himalayan Region: Ladakh and Zanskar — lies beyond the Greater Himalayas; cold desert, very little rainfall.
Mountain Passes: Karakoram Pass, Nathu La Pass (Sikkim-China border), Banihal, Zoji La (Kashmir).
2. The Northern Plains
A vast alluvial plain formed by the deposition of sediments from the Himalayan rivers — one of the most fertile and densely populated regions in the world. Extends ~2,400 km from Punjab to Assam.
Major River Systems and Their Plains:
- Indus Plain (Punjab and Haryana): Created by the Indus and its tributaries (Jhelum, Chenab, Ravi, Beas, Sutlej) — called Punjab (land of five rivers)
- Ganga Plain (Uttar Pradesh and Bihar): Created by the Ganga and its tributaries (Yamuna, Ghaghara, Gandak, Kosi) — the most densely populated plain in the world
- Brahmaputra Plain (Assam): The Brahmaputra and its tributaries create this eastern plain — prone to flooding
Bhabar: A narrow belt of porous pebbles and boulders deposited at the foot of the Himalayas — rivers disappear here and flow underground.
Terai: Wet, marshy region south of Bhabar — very fertile, supports dense vegetation and wildlife ( Dudhwa National Park).
3. The Peninsular Plateau
An ancient, stable landmass — one of the oldest geological formations on Earth. Composed mainly of igneous and metamorphic rocks. It is divided into:
Central Highlands: The Malwa Plateau (bounded by the Vindhyas and Aravalis), Chota Nagpur Plateau (Jharkhand, rich in minerals — iron ore, mica, coal), Bundelkhand.
Deccan Plateau: South of the Narmada River — triangular shape, composed of ancient crystalline rocks. Major ranges:
- Western Ghats (Sahyadri): Steeper, higher (1,000–1,500 m), continuous, runs along Arabian Sea coast — receives heavy monsoon rainfall; known for evergreen forests
- Eastern Ghats: Lower (600–900 m), discontinuous, runs along Bay of Bengal coast; more degraded than Western Ghats
Western Ghats biodiversity hotspot: Contains endemic species found nowhere else — e.g., Malabar Giant Squirrel, Lion-tailed Macaque, Malabar Trogon. UNESCO World Heritage Site (Western Ghats, 2012).
4. The Indian Desert
The Thar Desert (Great Indian Desert) is located in the northwestern state of Rajasthan. It is a sandy desert with shifting sand dunes, extreme temperature variation (very hot in summer, cold in winter), and sparse vegetation.
Key features: Luni River (only major river), dunes (barchans, longitudinal), desert vegetation (acacia, keekar), camel-based pastoral economy.
5. Coastal Plains
Western Coastal Plain: Narrow plain between the Western Ghats and Arabian Sea. From Gujarat (Rann of Kutch) to Karnataka (Mangalore).
- Konkan (Mumbai to Goa): Broad, flat
- Malabar Coast (Kerala): Lagoons and backwaters (famous Kerala backwaters)
- Canara (Karnataka): Continuous beach line
Eastern Coastal Plain: Broader plain between Eastern Ghats and Bay of Bengal. From West Bengal to Tamil Nadu.
- Utkal Plain (Odisha): Mahanadi, Brahmani, Baitarni rivers deposit large amounts of silt — forms deltaic plains (Chilika Lake, India’s largest brackish water lake)
- Coromandel Coast (Tamil Nadu): Experienced cyclones from Bay of Bengal; deltaic regions of Kaveri, Pennar rivers
Important Lagoons: Pulicat Lake (AP/TN), Chilika (Odisha), Vembanad (Kerala).
6. The Islands
Andaman and Nicobar Islands: Located in the Bay of Bengal. The northern islands are volcanic in origin; the southern group is more equatorial in climate. Port Blair (capital), cellular jail (Viper Island historical site). Total 572 islands; only about 38 inhabited.
Lakshadweep Islands: Located in the Arabian Sea, off Kerala coast. Coral atolls (ring-shaped coral islands), very small in area, limited vegetation. Kavaratti is the capital.
Rivers of India
Himalayan Rivers (Perennial — snow-fed)
These rivers originate in the Himalayas and are fed by both snowmelt and rainfall, making them perennial (flow throughout the year).
- Indus: originates at Senge Kangri (Tibet), flows through Ladakh, enters Arabian Sea via Pakistan; tributaries: Jhelum, Chenab, Ravi, Beas, Sutlej (Punjab rivers — “Indus system”)
- Ganga: originates at Gangotri glacier (Uttrakhand) as Bhagirathi, joins Alaknanda at Devprayag to become Ganga; major tributaries: Yamuna, Ghaghara, Gandak, Kosi
- Brahmaputra: originates at Mansarovar lake (Tibet), flows as Yarlung Tsangpo, enters India in Arunachal Pradesh as Dihang, then Brahmaputra; flows through Assam (Majuli river island — world’s largest inhabited riverine island)
Peninsular Rivers (Rain-fed, mostly seasonal)
- Mahanadi (Odisha): Hirakud Dam built on it
- Godavari (Andhra Pradesh): Largest peninsular river, also called “Dakshina Ganga”
- Krishna (Karnataka, Andhra): Tungabhadra is major tributary
- Kaveri/Cauvery (Karnataka, Tamil Nadu): Important for irrigation in Tamil Nadu’s delta region; Kaveri water dispute between Karnataka and Tamil Nadu
- Narmada (Madhya Pradesh, Gujarat): Flows through a rift valley between Vindhya and Satpura; Sardar Sarovar Dam (Narmada project)
- Tapi (Maharashtra, Gujarat): Flows parallel to Narmada
- Brahmani (Odisha): Important river in Odisha
Deltas: River deltas form where rivers meet the sea — Ganga-Brahmaputra delta (world’s largest, Sundarbans), Mahanadi delta, Godavari delta, Kaveri delta.
Climate of India
India has a monsoon-type climate — characterized by seasonal reversal of winds:
- Southwest Monsoon (June–September): Warm, moisture-laden winds from the Indian Ocean bring heavy rainfall to most of India
- Northeast Monsoon (October–November): Winds reverse, affect Coromandel Coast (Tamil Nadu gets rain from this)
- Retreating Monsoon (December): Monsoon withdraws from northwest
Climatic regions (after Köppen):
- Tropical monsoon (most of India): Heavy summer rain
- Tropical savanna (central India): Dry winter
- Semi-arid (Rajasthan, Gujarat): Low rainfall
- Humid subtropical (Northeast: Assam, West Bengal)
- Mountain climate (Himalayan region): Very cold winters
Western Disturbances: Extra-tropical storms from the Mediterranean that bring winter rain to North India — important for rabi crops (wheat).
Natural Vegetation
India has six major vegetation types (in order of altitude/dryness):
- Tropical Evergreen Forest (Western Ghats, Northeast): Dense, multi-layered, no defined leaf-fall season, receive >200 cm rainfall
- Tropical Deciduous Forest (most of India): Monsoon forests, trees shed leaves in dry season — teak, sal, bamboo
- Tropical Thorn Forest (Rajasthan, Gujarat, Punjab): Dry areas, thorny vegetation, <60 cm rainfall
- Montane Forest (Himalayas): Subtropical (shisham, oak) → Temperate (deodar, pine, cedar) → Alpine (birch, juniper) → Tundra near snowline
- Mangrove Forest (Sundarbans, deltaic coasts): Tidal forests, tolerant of salt water; Sundarbans (West Bengal) is the largest mangrove forest in the world
- Littoral and Swamp Forest (coastal marshy areas)
Soil Types of India
| Soil | Region | Features |
|---|---|---|
| Alluvial | Northern plains (Punjab, UP, Bihar) | Most fertile, two types: Bangar (older, more clay) and Khadar (newer, sandy) |
| Black (Regur) | Deccan plateau (Maharashtra, MP, Telangana) | Derived from basalt, self-ploughing, holds moisture well |
| Red | Tamil Nadu, Karnataka, Odisha | Iron oxide rich, found in high rainfall areas |
| Yellow | Eastern plains | Similar to red but less iron |
| Laterite | Kerala, Karnataka, MP, Assam | Heavy rainfall areas,贫瘠 (infertile), leached |
| Desert/Arid | Rajasthan, Gujarat | Sandy, low organic matter |
| Mountain | Himalayan region | Forest soil, loamy, acidic in higher altitudes |
CTET Exam Focus
- Himalayas: Three ranges, formation (plate tectonics), passes
- Northern plains: Alluvial, three major river systems
- Peninsular plateau: Central highlands, Deccan, Western vs Eastern Ghats
- Western Ghats: UNESCO heritage, biodiversity hotspot, evergreen forests
- Rivers: Himalayan (perennial) vs Peninsular (seasonal), major rivers and their origins
- Climate: Monsoon system — southwest monsoon, northeast monsoon
- Soil types: Alluvial (most fertile), black cotton soil (Deccan), laterite, red
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