Indian Geography: Physical Features — Mountains, Rivers, Plains, Plateaus
Complete notes on India's physical geography — the Himalayas, Northern Plains, Peninsular Plateau, major rivers, and coastal features. Based on NCERT Class 9 Contemporary India.
Indian Geography is one of the most predictable PSC topics — the same facts get asked repeatedly. Expect 4-6 questions per paper. These notes cover the physical features of India based on NCERT Class 9 (Contemporary India, Chapter 2) with PSC-specific emphasis.
India at a Glance
| Fact | Detail |
|---|---|
| Total area | 32.8 lakh sq km (3.28 million sq km) |
| World rank by area | 7th largest |
| Latitudinal extent | 8°4’N to 37°6’N |
| Longitudinal extent | 68°7’E to 97°25’E |
| Standard Meridian | 82°30’E (passes through Mirzapur, UP) |
| Total coastline | ~7,516 km |
| Land border | ~15,200 km |
| Neighbouring countries | 7 (Pakistan, Afghanistan, China, Nepal, Bhutan, Bangladesh, Myanmar) |
| Southernmost point (mainland) | Kanyakumari (Tamil Nadu) |
| Southernmost point (India) | Indira Point (Great Nicobar Island) |
| Northernmost point | Indira Col (Siachen, J&K) |
PSC favourites: Standard Meridian = 82°30’E (Mirzapur). Southernmost point of India = Indira Point (not Kanyakumari — that’s mainland only). Total coastline = 7,516 km.
The Six Physiographic Divisions
India has 6 major physiographic divisions (NCERT classification):
1. The Himalayan Mountains
The youngest fold mountains in the world, formed by the collision of the Indian and Eurasian tectonic plates.
Three parallel ranges (south to north):
| Range | Also called | Key features | Average height |
|---|---|---|---|
| Shiwalik | Outer Himalayas | Youngest; composed of loose sediments; Duns (valleys) between Shiwalik and Middle Himalayas | 900-1,100 m |
| Himachal/Lesser Himalayas | Middle Himalayas | Hill stations (Shimla, Mussoorie, Nainital); Pir Panjal range | 3,700-4,500 m |
| Himadri/Greater Himalayas | Inner Himalayas | Highest peaks; permanently snow-covered; Mt. Everest, K2, Kanchenjunga | 6,000+ m |
Important Himalayan peaks:
| Peak | Height | Location |
|---|---|---|
| Mt. Everest | 8,849 m | Nepal-Tibet border (highest in the world) |
| K2 (Godwin-Austen) | 8,611 m | PoK/Karakoram (highest in India by claim) |
| Kanchenjunga | 8,586 m | Sikkim-Nepal border (highest peak entirely in India) |
| Nanda Devi | 7,816 m | Uttarakhand (highest peak wholly within India’s borders) |
PSC trap: “Highest peak in India” — If the question says “within India’s borders,” the answer is Kanchenjunga (8,586 m) or Nanda Devi (7,816 m, wholly within India). If it says “Indian territory,” K2 is claimed but disputed. Read the question carefully.
Important Himalayan passes:
| Pass | State | Connects |
|---|---|---|
| Karakoram Pass | Ladakh | India–China (highest motorable pass area) |
| Rohtang Pass | Himachal Pradesh | Kullu–Lahaul-Spiti |
| Nathu La | Sikkim | India–China |
| Shipki La | Himachal Pradesh | India–Tibet |
| Bom Di La | Arunachal Pradesh | India–Tibet |
| Zoji La | J&K | Kashmir–Ladakh |
| Jelep La | Sikkim | India–Tibet |
| Palakkad Gap | Kerala | Kerala–Tamil Nadu (only major gap in Western Ghats) |
2. The Northern Plains
Formed by the alluvial deposits of the Indus, Ganga, and Brahmaputra river systems. Most fertile and densely populated region.
Divisions of the Northern Plains:
| Division | Description |
|---|---|
| Bhabar | Narrow belt at the foot of Shiwaliks; pebble-studded; rivers disappear underground |
| Terai | South of Bhabar; marshy, swampy; forests (now largely cleared) |
| Bhangar | Older alluvial soil (above flood plain); contains kankar (nodules of calcium carbonate) |
| Khadar | Newer alluvial soil (flood plain); renewed every year; most fertile |
PSC distinction: Bhangar = OLD alluvium (higher, less fertile). Khadar = NEW alluvium (flood plain, more fertile). This is a frequently tested distinction.
3. The Peninsular Plateau
The oldest landmass of India — part of the ancient Gondwana land. Composed of old crystalline, igneous, and metamorphic rocks.
Two subdivisions:
- Central Highlands: North of Narmada river. Includes Malwa Plateau, Bundelkhand, Chotanagpur Plateau.
- Deccan Plateau: South of Narmada. Tilts east — most peninsular rivers flow eastward. Bordered by Western Ghats and Eastern Ghats.
Western Ghats vs Eastern Ghats:
| Feature | Western Ghats | Eastern Ghats |
|---|---|---|
| Continuity | Continuous (unbroken except Palakkad Gap) | Discontinuous (broken by rivers) |
| Average height | 900-1,600 m | 600 m |
| Highest peak | Anamudi (2,695 m, Kerala) | Mahendragiri (1,501 m, Odisha) |
| Rainfall side | Windward (heavy rainfall on western side) | Rain shadow |
| Key gap | Palakkad Gap (Kerala-Tamil Nadu) | Multiple river valleys |
Anamudi (2,695 m) in Idukki, Kerala is the highest peak in South India and the highest peak of the Western Ghats. PSC asks this frequently.
4. The Indian Desert (Thar Desert)
- Located in western Rajasthan
- Arid region with sand dunes (barchans)
- Luni is the only significant river (flows into Rann of Kutch)
- Receives less than 150 mm rainfall
- Indira Gandhi Canal brings Ravi-Beas water to the desert
5. The Coastal Plains
Western Coastal Plain (narrow):
- Gujarat coast → Konkan (Maharashtra) → Karnataka coast → Malabar coast (Kerala)
- Narrow due to proximity of Western Ghats to the sea
- Kerala’s backwaters (kayals) are a unique feature
Eastern Coastal Plain (wider):
- Coromandel coast (Tamil Nadu) → Northern Circars (Andhra) → Utkal coast (Odisha)
- Wider because Eastern Ghats are far from the coast
- Chilika Lake (Odisha) — largest brackish water lake in India
- Pulicat Lake — on Tamil Nadu-Andhra border
6. The Islands
- Andaman and Nicobar Islands: Bay of Bengal; 572 islands; volcanic origin (Barren Island — only active volcano in India)
- Lakshadweep: Arabian Sea; 36 islands; coral origin; smallest UT by area
Sundarbans: World’s largest mangrove forest, located in the Ganga-Brahmaputra delta (West Bengal + Bangladesh). UNESCO World Heritage Site. Home to the Royal Bengal Tiger. PSC asks this frequently.
Major Rivers of India
Himalayan Rivers (perennial — snow-fed + rain-fed)
| River | Origin | Drains into | Length (India) | Key fact |
|---|---|---|---|---|
| Ganga | Gangotri Glacier (Devprayag — confluence of Bhagirathi and Alaknanda) | Bay of Bengal | 2,510 km | Longest river in India |
| Brahmaputra | Angsi Glacier, Tibet (Manasarovar area) | Bay of Bengal | 916 km in India | Called Tsangpo in Tibet, Jamuna in Bangladesh |
| Indus | Mansarovar Lake, Tibet | Arabian Sea | 1,114 km in India | Treaty: Indus Waters Treaty (1960) |
| Yamuna | Yamunotri Glacier | Ganga (at Allahabad/Prayagraj) | 1,376 km | Longest tributary of Ganga |
Peninsular Rivers (seasonal — rain-fed only)
| River | Origin | Drains into | Length | Key fact |
|---|---|---|---|---|
| Godavari | Nashik, Maharashtra | Bay of Bengal | 1,465 km | Longest peninsular river; “Dakshin Ganga” |
| Krishna | Mahabaleshwar, Maharashtra | Bay of Bengal | 1,400 km | Second longest peninsular river |
| Narmada | Amarkantak, MP | Arabian Sea | 1,312 km | Flows westward (exception) |
| Tapi | Satpura Range, MP | Arabian Sea | 724 km | Flows westward (exception) |
| Cauvery | Talakaveri, Kodagu, Karnataka | Bay of Bengal | 800 km | ”Ganga of the South” |
| Mahanadi | Sihawa, Chhattisgarh | Bay of Bengal | 860 km | Hirakud Dam (longest earthen dam in India by length, ~26 km) |
Critical PSC fact: Most peninsular rivers flow eastward into the Bay of Bengal. Only Narmada and Tapi flow westward into the Arabian Sea. This is because the Peninsular Plateau tilts from west to east.
Lakes of India
| Lake | State | Type | Key fact |
|---|---|---|---|
| Chilika | Odisha | Brackish | Largest brackish water lake in India |
| Wular | J&K | Freshwater | Largest freshwater lake in India |
| Dal | J&K | Freshwater | Famous for houseboats |
| Vembanad | Kerala | Brackish | Longest lake in India |
| Sambhar | Rajasthan | Salt | Largest inland salt lake in India |
| Loktak | Manipur | Freshwater | Only floating lake (phumdis); Keibul Lamjao NP |
Soils of India
| Soil type | Colour | Found in | Best for |
|---|---|---|---|
| Alluvial | Light grey | Northern Plains, river deltas | Most crops; most widespread |
| Black (Regur) | Black | Deccan Plateau (Maharashtra, Gujarat, MP) | Cotton (“black cotton soil”) |
| Red | Red (iron oxide) | Eastern Deccan, Tamil Nadu, Kerala | Millets, pulses |
| Laterite | Brick red | Western Ghats, Kerala, Karnataka | Tea, coffee, cashew |
| Arid/Desert | Sandy | Rajasthan | Poor for agriculture |
| Forest/Mountain | Dark brown | Himalayan region | Depends on altitude |
PSC fact: Kerala’s predominant soil is Laterite soil — rich in iron and aluminium, poor in nitrogen and organic matter. Good for plantation crops (tea, coffee, rubber, cashew).
Frequently Asked PSC Questions
- Standard Meridian of India? — 82°30’E (Mirzapur, UP)
- Southernmost point of India? — Indira Point (Great Nicobar)
- Longest river in India? — Ganga (2,510 km)
- Longest peninsular river? — Godavari (1,465 km)
- Which rivers flow westward? — Narmada and Tapi
- Highest peak in South India? — Anamudi (2,695 m, Kerala)
- Only active volcano in India? — Barren Island (Andaman)
- Largest brackish lake? — Chilika (Odisha)
- Largest freshwater lake? — Wular (J&K)
- Palakkad Gap connects? — Kerala and Tamil Nadu
- Black soil is best for? — Cotton
- Bhangar vs Khadar? — Old alluvium vs new alluvium
Notes based on NCERT Class 9 Contemporary India Chapter 2 (Physical Features of India), Chapter 3 (Drainage), Chapter 4 (Climate). Updated April 2026.