Physical Geography of India
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Physical Geography of India — Key Facts for KPSC KAS • Location: Lies between 8°4’N and 37°6’N latitudes and 68°7’E and 97°25’E longitudes — entirely in the Northern Hemisphere. Total area: 3.28 million sq km (7th largest). • Neighbours: Pakistan, China (Tibet), Nepal, Bhutan, Bangladesh, Myanmar. Maritime neighbours: Sri Lanka, Maldives, Indonesia. • Himalayan Mountains: 2,500 km long arc from Kashmir to Arunachal Pradesh. Three parallel ranges: Greater Himalayas (Himadri), Lesser Himalayas (Himachal), Shiwaliks. • Northern Plains: Formed by Indus, Ganga, and Brahmaputra river systems. Alluvial soil, extremely fertile. Four divisions: Bhabar, Terai, Bangar, Khadar. • Peninsular Plateau: Comprises Central Highlands (Malwa, Bundelkhand, Chota Nagpur, Meghalaya) and Deccan Plateau (Western Ghats, Eastern Ghats, Eastern Coastal Plain, Western Coastal Plain). • Desert: Thar Desert in Rajasthan — Great Indian Desert, aeolian sand deposits. • Coastline: 7,517 km including islands. Western coastal plain (Konkan, Karnataka, Malabar) and Eastern coastal plain (Coromandel, Utkal).
⚡ Exam tip: KPSC KAS frequently asks about the divisions of the Himalayas, northern plain divisions, and peninsular plateau regions. Questions often require identifying specific passes, peaks, or river systems on a map.
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Physical Geography of India — KPSC KAS Study Guide
India’s Physical Features
The Himalayan Mountain System
The Himalayas form a geological young fold mountain system created by the collision of the Indian plate with the Eurasian plate (approximately 25-30 million years ago, continuing at 5 cm per year).
Three Parallel Ranges:
| Range | Altitude | Key Features |
|---|---|---|
| Greater Himalayas (Himadri) | 6,000+ metres | Permanent snowline; highest peaks including Mount Everest (8,849m), K2 (8,611m) |
| Lesser Himalayas (Himachal) | 3,700-4,500 metres | Densely forested; major hill stations (Shimla, Mussoorie, Nainital) |
| Shiwaliks (Outer Himalayas) | 900-1,500 metres | Unconsolidated sediments; Dun valleys |
Important Passes: Khyber Pass (connects India-Afghanistan), Banihal, Zoji La (Kashmir), Nathula (Sikkim-China border), Bomdila (Arunachal Pradesh).
Kashmir Himalayas: Ladakh plateau (cold desert), Kashmir valley, Jammu region Himachal Pradesh Himalayas: Famous for hydroelectric projects (Bhakra Nangal) Uttarakhand Himalayas: Source rivers of Ganga system; pilgrim centres (Char Dhams) Nepal Himalayas: Entirely in Nepal; Annapurna, Dhaulagiri ranges Assam Himalayas: Easternmost section; Brahmaputra enters India through Sadiya
The Northern Plains
Formed by deposition of alluvial sediments from three major river systems over millions of years. Extends 2,400 km east-west and 240-320 km north-south.
Four Divisions:
- Bhabar: Pebble-conglomerate deposits at foothills; streams disappear underground
- Terai: Wet, marshy zone south of Bhabar; re-emerged streams
- Bangar: Old alluvial deposits with calcarious nodules (Kankar); more elevated
- Khadar: New floodplain deposits; renewed every flooding season; most fertile
Punjab Plains: Created by Indus and its five tributaries (Satluj, Beas, Ravi, Chenab, Jhelum). Doabs between rivers.
Ganga Plains: Most extensive; covers parts of Haryana, Delhi, UP, Bihar, Jharkhand, West Bengal. Divides into Ganga-Yamuna Doab, Bihar Rohdoen, Bengal Delta.
Brahmaputra Plains: Assam valley; characterized by Brahmaputra’s braided channel and ** Majuli island** (world’s largest river island).
The Peninsular Plateau
Divided into the Central Highlands (north of Narmada) and Deccan Plateau (south of Narmada).
Central Highlands:
- Malwa Plateau: Between Madhya Pradesh and Rajasthan; Chambal, Sind, Betwa rivers
- Bundelkhand Upland: Between Yamuna and Vindhya; largely scrubland
- Chota Nagpur Plateau: Eastern plateau; richest mineral belt (Jharkhand, West Bengal, Odisha); Damodar, Subarnarekha rivers
- Meghalaya Plateau: Northeast; separated by Garo and Khasi hills
Deccan Plateau:
- Western Ghats: 1,600 km; UNESCO World Heritage at Western Ghats (2012); altitude 900-1,800 metres; passes: Palakkad (0-77m), Goa passes
- Eastern Ghats: 1,400 km; discontinuous; lower altitude than Western Ghats
- Western Coastal Plain: Narrow (50-80 km); rivers short; includes Konkan Plain (Maharashtra), Karnataka Coastal Plain, Malabar Coast (Kerala)
- Eastern Coastal Plain: Broad (80-100 km); rivers longer; includes Coromandel Coast (TN), Utkal Coast (Odisha); Mahanadi Delta (Odisha)
Western Coastal Plain vs Eastern Coastal Plain: The western coast is characterized by backwaters (Kerala’s Kuttanad system) and rial formations, while the eastern coast has deltas and lagoons. The western coast is geologically older.
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Physical Geography of India — Comprehensive KPSC KAS Notes
Geological Origins and Tectonic Framework
Plate Tectonic Context
India’s landmass was once part of the ancient supercontinent Gondwanaland. Approximately 180 million years ago, it began separating and drifting northward until colliding with the Eurasian plate. This collision:
- Created the Himalayas (still rising at 5 cm/year)
- Formed the Tibetan Plateau
- Created the Tethys Sea which once separated the landmasses
Evidence of ongoing tectonic activity:
- Regular earthquakes in the Himalayan region (2005 Kashmir earthquake — 7.6 magnitude)
- The 2015 Nepal earthquake (7.8 magnitude) demonstrated continued plate collision effects
- Volcanic activity in the Andaman and Nicobar Islands
Himalayan Division Details
Kashmir Himalayas:
- Karakoram Range: Beyond Himalayas; K2 (8,611m — world’s 2nd highest), Siachen Glacier (76 km — world’s 2nd longest outside polar regions)
- Zaskar Range: Between Greater Himalayas and Lesser Himalayas in Kashmir
- Kashmir Valley: Oval-shaped valley between Pir Panjal and Zaskar ranges; Jhelum River flows through
- Kashmir’s physical significance: Acts as a strategic buffer zone; source of major rivers (Indus, Jhelum, Chenab, Beas, Ravi)
Himachal and Uttarakhand Himalayas:
- Major hydroelectric potential (Bhakra Nangal Dam, Tehri Dam)
- Dhauladhar Range: Visible from Punjab plains; distinctive white limestone appearance
- Kinnaur Himalayas: Sutlej river valley; significant apple production region
Nepal Himalayas:
- Entirely contained within Nepal
- Kangchenjunga (8,586m — world’s 3rd highest, on Nepal-Sikkim border)
- Annapurna range (8,091m — popular trekking destination; site of tragic 2014 avalanche)
Assam Himalayas (Eastern Himalayas):
- Namcha Barwa (7,782m) — easternmost peak of the Himalayas
- Brahmaputra’s entry into India: Through the Sadiya gap in Arunachal Pradesh
- Dafla Hills and Miri Hills as sub-ranges
The Northern Plains: Formation and Features
The northern plains are an example of depositional topography created by the Himalayan rivers depositing massive quantities of alluvial sediments over millions of years. Three distinct fill periods are recorded:
- Sivalik sediments (Shiwalik formation): Gravel and conglomerate
- Older alluvium (Bangar): Sandy, clay-rich
- Newer alluvium (Khadar): Fine silt, renewed by annual flooding
Punjab-Haryana Plain:
- Known as the Granary of India; intensive agriculture supported by canal irrigation
- Bhakra Nangal Project: Multi-purpose river valley project
- Doabs are important agricultural zones
Ganga Plain subdivisions:
- Upper Ganga Plain: Delhi to Allahabad; intensive irrigation (Ganga Canal system)
- Middle Ganga Plain: Allahabad to Maldah (Bihar); rice-wheat rotation dominant
- Lower Ganga Plain: Maldah to Bay of Bengal; delta formation begins
Bengal Delta:
- World’s largest delta (75,000 sq km)
- Sunderbans: Mangrove forest; UNESCO World Heritage Site (1987 and 1992); tiger reserve
- Active delta building; subsidence evident in frequent flooding
The Peninsular Plateau: Geological Structure
The peninsular plateau is composed of ancient block mountains and rift valleys — among the world’s most stable geological formations.
Gondwana Rocks: The Damodar Valley contains Gondwana coal deposits (Permian period, 250 million years old) — approximately 90% of India’s coal reserves.
Deccan Trap: Extensive volcanic basalt formations covering approximately 500,000 sq km in Maharashtra, Gujarat, and parts of Karnataka. Created by volcanic eruptions approximately 65 million years ago (coinciding with dinosaur extinction). Rich black cotton soil (Regur) develops on these basaltic formations.
Chota Nagpur Plateau — Mineral Heartland:
- Jharia coalfield: Primary coking coal reserves
- Singareni coalfield: Telangana
- Mica, micaite, copper, iron ore, manganese — all extracted here
Western vs Eastern Ghats: A Comparison
| Feature | Western Ghats | Eastern Ghats |
|---|---|---|
| Length | 1,600 km | 1,400 km |
| Continuity | More continuous | Discontinuous |
| Average altitude | 900-1,800 m | 500-1,500 m |
| Highest peak | Anamudi (2,695 m, Kerala) | Mahendragiri (1,501 m, Odisha) |
| Rivers | Short, fast-flowing | Longer rivers (Mahanadi, Godavari, Krishna) |
| passes | Palakkad Gap most important | Multiple river gaps |
| Rainfall | Higher (2000-3000 mm) | Lower (1000-1500 mm) |
Islands
Andaman and Nicobar Islands:
- 572 islands; Bay of Bengal
- Barren Island (Andaman): Active volcano (last eruption 2017)
- Indira Point (Great Nicobar): Southernmost point of Indian territory
- Biodiversity hotspot: Coral reefs, indigenous tribal communities
Lakshadweep Islands:
- 36 islands; Arabian Sea; coral atolls
- Total area: 32 sq km (smallest union territory)
- Minicoy Island: Strategically located near the Nine Degree Channel
Examination Strategy
Commonly asked KPSC KAS questions:
- Differentiate between Western and Eastern Ghats
- Explain the formation of the Northern Plains
- Describe the Himalayan divisions and their characteristics
- Discuss the Western Coastal Plain vs Eastern Coastal Plain
- Identify major passes and their significance
Key distinctions:
- Doab: Land between two rivers (Punjab has five Doabs)
- Bhabar vs Terai: Bhabar is pebble-conglomerate zone where streams disappear; Terai is marshy zone where streams re-emerge
- Bangar vs Khadar: Old alluvium vs new floodplain deposits
- Constitutional vs geographical boundaries: States don’t always follow physical geography features
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