Indian Geography
India’s Physical Features
India occupies the Indian subcontinent, covering approximately 3.28 million sq km — the 7th largest country in the world and the 2nd most populous. 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.
India has a coastline of 7,516 km — 5,422 km on the mainland plus 1,094 km of island coasts. The land boundary is 15,200 km.
The Himalayan Mountains
The Himalayas form the northern boundary, 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 causes earthquakes in North India).
Three Parallel Ranges (from south to north):
| Range | Also Known As | Elevation | Key Features |
|---|---|---|---|
| Greater Himalayas (Himadri) | High Himalayas | 5,500–8,000 m | Permanent snow; highest peaks (Everest, K2) |
| Lesser Himalayas (Himachal) | Middle Himalayas | 2,000–3,000 m | Hill stations (Shimla, Mussoorie, Nainital) |
| Shivalik Hills (Outer Himalayas) | Sub-Himalayas | 600–1,500 m | Composed of soft rock, susceptible to landslides |
Trans-Himalayan region: Ladakh and Zanskar — cold desert, very little rainfall, lies beyond the Greater Himalayas.
Mountain passes: Karakoram Pass, Nathu La (Sikkim-China border), Banihal, Zoji La (Kashmir).
Famous peaks: Mt. Everest (8,849 m, Nepal), K2 (8,611 m, Pakistan-occupied), Kangchenjunga (8,586 m, India-Nepal), Nanda Devi (7,816 m), Kamet (7,756 m).
The Northern Plains
Formed by the deposition of sediments from Himalayan rivers — one of the most fertile and densely populated regions. Extends approximately 2,400 km from Punjab to Assam.
Major River Systems:
- Indus system (Punjab): Indus and its tributaries (Jhelum, Chenab, Ravi, Beas, Sutlej) — “Punjab” = land of five rivers
- Ganga system (Uttar Pradesh, Bihar): Ganga and tributaries (Yamuna, Ghaghara, Gandak, Kosi)
- Brahmaputra system (Assam): Brahmaputra and tributaries — creates the world’s largest river island Majuli
Bhabar belt: A narrow belt of porous pebbles at the foot of the Himalayas where rivers disappear underground.
Terai: Wet, marshy region south of Bhabar — very fertile, supports dense vegetation.
The Peninsular Plateau
An ancient, stable landmass — one of the oldest geological formations. Composed mainly of igneous and metamorphic rocks.
Central Highlands: Malwa Plateau (bounded by Vindhyas and Aravalis), Chota Nagpur Plateau (Jharkhand — rich in minerals: iron ore, mica, coal).
Deccan Plateau: South of the Narmada River — triangular shape.
Western Ghats (Sahyadri): Steeper, higher (1,000–1,500 m), continuous — runs along Arabian Sea coast; receives heavy monsoon rainfall; known for evergreen forests. UNESCO World Heritage Site (Western Ghats, 2012).
Eastern Ghats: Lower (600–900 m), discontinuous — runs along Bay of Bengal coast.
Western Ghats biodiversity: Endemic species (Malabar Giant Squirrel, Lion-tailed Macaque, Malabar Trogon) found nowhere else.
Coastal Plains
Western Coastal Plain (Arabian Sea): From Gujarat (Rann of Kutch) to Karnataka (Mangalore).
- Konkan (Mumbai to Goa): Broad, flat
- Malabar Coast (Kerala): Famous for lagoons and backwaters
- Karnataka coast
Eastern Coastal Plain (Bay of Bengal): From West Bengal to Tamil Nadu.
- Utkal Plain (Odisha): Major river deltas (Mahanadi)
- Coromandel Coast (Tamil Nadu): Experienced cyclones; Kaveri delta
Important lagoons: Chilika Lake (Odisha — India’s largest brackish water lake), Pulicat Lake (AP/TN), Vembanad (Kerala).
Islands
Andaman and Nicobar Islands: Located in Bay of Bengal. 572 islands; Port Blair (capital); cellular jail (Viper Island). The southern group is more equatorial in climate.
Lakshadweep Islands: Located in Arabian Sea, off Kerala coast. Coral atolls (ring-shaped coral islands); Kavaratti is the capital.
The Indian Desert
The Thar Desert (Great Indian Desert) is in northwestern Rajasthan. Sandy desert with shifting sand dunes (barchans, longitudinal), extreme temperature variation.
Rivers of India
Himalayan Rivers (Perennial — snow-fed)
These rivers originate in the Himalayas and are fed by both snowmelt and rainfall, making them flow throughout the year.
| River | Origin | Course | Key Features |
|---|---|---|---|
| Indus | Senge Kangri (Tibet) | Flows through Ladakh → enters Arabian Sea (via Pakistan) | “Punjab rivers” are tributaries: Jhelum, Chenab, Ravi, Beas, Sutlej |
| Ganga | Gangotri glacier (Uttrakhand) as Bhagirathi → joins Alaknanda at Devprayag | Flows through North India → enters Bay of Bengal via Bangladesh (as Padma) | Major tributaries: Yamuna, Ghaghara, Gandak, Kosi; Prayagraj (Allahabad) confluence |
| Brahmaputra | Mansarovar lake (Tibet) as Yarlung Tsangpo | Enters India in Arunachal Pradesh as Dihang → Brahmaputra | Flows through Assam (Majuli — world’s largest inhabited riverine island) |
Peninsular Rivers (Rain-fed, mostly seasonal)
| River | Origin | Flows Through | Key Features |
|---|---|---|---|
| Mahanadi | Chhattisgarh | Odisha | Hirakud Dam built on it |
| Godavari | Maharashtra (Western Ghats) | Maharashtra, Telangana, Andhra | Largest peninsular river; called “Dakshina Ganga” |
| Krishna | Maharashtra | Karnataka, Telangana, Andhra | Tungabhadra is major tributary |
| Kaveri/Cauvery | Karnataka (Western Ghats) | Karnataka, Tamil Nadu | Important irrigation for Tamil Nadu; Kaveri water dispute |
| Narmada | Amarkantak (MP) | MP, Gujarat | Flows through a rift valley between Vindhya and Satpura; Sardar Sarovar Dam |
| Tapi | Satpura range (MP) | MP, Maharashtra, Gujarat | Flows parallel to Narmada |
| Brahmani | Odisha | Odisha | Important river in Odisha |
Deltas: Ganga-Brahmaputra delta (world’s largest, Sundarbans), Mahanadi delta, Godavari delta.
Climate of India
India has a monsoon-type climate — characterized by seasonal reversal of winds.
Seasons
Southwest Monsoon (June–September): Warm, moisture-laden winds from the Indian Ocean and Bay of Bengal bring heavy rainfall to most of India. This is the main rainy season.
Northeast Monsoon (October–November): Reversal — affects Coromandel Coast (Tamil Nadu receives most of its rain from this).
Winter (December–February): Western Disturbances (extra-tropical storms from the Mediterranean) bring winter rain to North India — important for rabi crops (wheat).
Summer (March–May): Hot, dry winds from Rajasthan (Loo) — often dust storms.
Climatic Regions (Köppen classification)
| Type | Region | Characteristics |
|---|---|---|
| Am | Kerala (Tropical monsoon) | Heavy rainfall on windward side of Western Ghats |
| As/Aw | Most of India | Tropical savanna — dry winter, wet summer |
| BWh | Rajasthan, Gujarat | Hot desert — very low rainfall |
| Cwg | Assam, West Bengal | Humid subtropical — heavy rainfall |
Rainfall
India receives an average of 118 cm of rainfall annually. The Cherrapunji (Meghalaya) and Mawsynram are the wettest places on Earth (due to orographic lift on the Khasi Hills). The Thar Desert in Rajasthan receives less than 20 cm.
Monsoon patterns: The southwest monsoon arrives in Kerala around June 1 (the normal date) and progresses northward. The withdrawal begins from September from the northwest.
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, receive >200 cm rainfall
- Tropical Deciduous Forest (Monsoon forest): Most of India — teak, sal, bamboo; trees shed leaves in dry season
- Tropical Thorn Forest: Rajasthan, Gujarat, Punjab — thorny vegetation, <60 cm rainfall
- Montane Forest: Himalayas — subtropical (shisham, oak) → temperate (deodar, pine) → alpine (birch, juniper)
- Mangrove Forest: Sundarbans (West Bengal — world’s largest), deltaic coasts — tidal forests, tolerant of salt water
- 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 |
| 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 | Leached;贫瘠 (infertile) |
| Desert/Arid | Rajasthan, Gujarat | Sandy; low organic matter |
| Mountain | Himalayan region | Forest soil; loamy; acidic at higher altitudes |
CTET Exam Focus
- Himalayas: Three ranges, formation (plate tectonics), passes, famous peaks
- Northern plains: Alluvial; three major river systems (Indus, Ganga, Brahmaputra)
- Peninsular plateau: Central highlands, Deccan, Western vs Eastern Ghats
- Western Ghats: UNESCO heritage site; biodiversity hotspot
- Rivers: Himalayan (perennial) vs Peninsular (seasonal); major rivers and tributaries
- Climate: Monsoon system; southwest vs northeast monsoon; Western Disturbances
- Soil types: Alluvial (most fertile), black cotton soil (Deccan), laterite, red
- Vegetation types: Evergreen, deciduous, thorn, montane, mangrove
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