- Drainage directions: Peninsular rivers drain east to Bay of Bengal, north to Ganga, and west to Arabian Sea.
- East-flowing rivers (Mahanadi, Godavari, Krishna, Kaveri) are longer, numerous and form deltas.
- West-flowing rivers (Narmada, Tapti, Sabarmati, Luni) are short, few and form estuaries, not deltas.
- The Peninsular Plateau is very rich in minerals, forests, wildlife and supports agriculture and industries.
- Waterfalls and rivers of the plateau are widely used for hydroelectric power and irrigation.
Key Points
Key Points: Introduction of Location and Extent
- India’s position & size → 7th largest country and 2nd most populous in the world; a true subcontinent.
- Location → Lies in South Asia, at the head of the Indian Ocean, between South-West and South-East Asia.
- Latitudinal & longitudinal extent → 8°4′N–37°6′N and 68°7′E–97°25′E; lies in the Northern Hemisphere.
- Tropic of Cancer → Passes almost through the middle, dividing India into tropical south and sub-tropical north.
- Unity in diversity → Great physical, climatic, cultural, linguistic and religious diversity, making India a land of contrasts.
Key Points: Physical Features of India
- Physiographic divisions of India → Northern Mountains, Northern Plains, Peninsular Plateau, Coastal Plains and Islands.
- Himalayas (Northern Mountain Wall) → Three parallel ranges: Himadri (Great Himalayas), Himachal (Lesser Himalayas) and Shiwalik (Outer Himalayas).
- Himadri range → Highest range with major peaks like Everest, K2, Kanchenjunga; source of glaciers such as Gangotri and Yamunotri.
- Himachal & Shiwalik ranges → Himachal has many hill stations and valleys; Shiwalik is low, discontinuous with gentle northern slopes.
- Special Himalayan features → Doons (flat valleys), Bhabhar (porous gravel belt), Terai (marshy fertile land), Khadar (new alluvium) and Bhangar (old alluvium).
Key Points: Physical Division of India > The Northern Mountain Walls
- The Himalayas are young fold mountains forming India’s Northern Mountain Wall, with three parallel ranges—Himadri, Himachal and Shiwalik.
- Himadri (Great Himalayas) is the highest and northernmost range, permanently snow-covered, with peaks like Mt. Everest, K2 and Kanchenjunga and major glaciers.
- Himachal (Middle Himalayas) lies south of Himadri, has rich vegetation, important ranges (Pir Panjal, Dhaula Dhar) and most hill stations.
- Shiwalik (Outer Himalayas) is the lowest and discontinuous range, with steep southern slopes, gentle northern slopes and average height of about 1000 m.
- Special Himalayan features include Doons (valleys), Bhabhar (porous plains), Terai (marshy belt) and fertile Khadar and Bhangar alluvial soils.
Key Points: Significance of the Great Northern Wall
- Climatic barrier – Himalayas block cold winds in winter and force monsoon winds to shed rain over North India and Brahmaputra valley.
- Source of rivers – Himalayan glaciers give rise to perennial rivers like Ganga, Yamuna and Brahmaputra, ensuring water and irrigation.
- Hydel power & fertility – Steep slopes create waterfalls for hydroelectric power and rivers deposit fertile alluvium in plains.
- Natural defence & tourism – Act as a protective wall against invasions; contain major hill stations, shrines and adventure sites.
- Rich resources – Himalayas have dense forests, wildlife and minerals; Western Himalayas get less rain, Eastern Himalayas receive heavy rainfall.
Key Points: Physical Divisions of India> North Indian Plains
- The North Indian Plains lie between the Himalayas and the Peninsular Plateau, from Rajasthan to Assam.
- They were formed by alluvial deposits from the Indus, Ganga, and Brahmaputra rivers.
- These plains are flat, low-lying, and suitable for farming and settlements.
- They cover one-fifth of India’s area but support nearly half of the population.
- The plains are divided into Rajasthan, Punjab–Haryana, the Ganga Plains, and the Brahmaputra Plains.
- The Punjab–Haryana and Ganga Plains are fertile, irrigated, and densely populated.
- The Brahmaputra Plains are marshy and include Majuli Island; the Sunderbans Delta is the world’s largest.
Key Points: Western Himalayas VS Eastern Himalayas
| Region / Plain | Key Points |
|---|---|
| Northern Plains | Formed by Indus, Ganga & Brahmaputra; very fertile |
| Punjab Plains | Indus tributaries; doabs; rich agriculture |
| Rajasthan Plains | Thar Desert; arid; Luni river; salt lakes |
| Ganga Plains | Highly fertile; dense population; bhabhar & terai |
| Brahmaputra Plains | Assam; marshy; floods; river islands |
Key Points: Significance of the Northern Plains
- Level and Extensive Plains – The Northern Plains are flat and widespread, making them easy to use for settlement and transport.
- Dense Population – Fertile soil, rivers and favourable climate support one of the most densely populated regions in the world.
- Rich Agriculture – Alluvial soil, irrigation from rivers and dams make the plains India’s main food-producing area.
- Cultural and Religious Importance – Sacred rivers like the Ganga and many historical and religious cities are located here.
- Good Transport and Trade – Flat land and navigable rivers help develop roads, railways, trade and communication.
Key Points: Physical Divisions of India> The Peninsula
- The Indian Peninsula lies south of the North Indian Plains and tapers toward the Indian Ocean.
- It is the oldest and largest physiographic division of India, mostly made of stable tableland.
- It is bounded by the Aravalli Range in the northwest and the Western and Eastern Ghats on the sides.
- The region includes many hill ranges and plateaus, such as the Vindhyas, Satpuda, and Aravalis.
- The Deccan Plateau is triangular and lies between the Western and Eastern Ghats, covering Maharashtra, Telangana, and Karnataka.
- The plateau is divided into Central Plateaus, Eastern Plateaus, Deccan Plateau, Kathiawar–Kutch region, and North-Eastern Plateau.
- This region is rich in minerals, has old rivers, and supports forests, farming, and mining.
Key Points: Western Ghats VS Eastern Ghats
| Western Ghats | Eastern Ghats |
|---|---|
| High & steep | Low & gentle |
| Continuous | Discontinuous |
| Source of rivers | Rivers cut through |
| Heavy monsoon rain | Little monsoon rain |
| Anai Mudi (2695 m) | Mahendragiri (1500 m) |
Key Points: Drainage System in the Peninsular India
Key Points: Physical Division of India > The Plateau Region
- The Plateau Region is an old shield landform, triangular in shape, with height 300–900 m above sea level.
- It is divided by the Narmada rift valley into Central Highlands (north) and Deccan Plateau (south).
- Central Highlands include Malwa, Bundelkhand, Baghelkhand and Chotanagpur Plateaus.
- The Deccan Plateau is divided into Maharashtra, Karnataka and Telangana Plateaus.
- The Deccan Plateau is bordered by Western Ghats (west) and Eastern Ghats (east), which meet at the Nilgiris; Anai Mudi is the highest peak of South India.
Key Points: Western Coastal Plains VS Eastern Coastal Plains
| Western Coastal Plains | Eastern Coastal Plains |
|---|---|
| Formed due to submergence | Formed due to deposition (emergence) |
| Between Arabian Sea & Western Ghats | Between Bay of Bengal & Eastern Ghats |
| Short, swift rivers, no deltas | Long rivers, large deltas |
| Many natural harbours | Few natural harbours |
| Narrow (≈ 64 km) | Broad (≈ 80–100 km) |
Key Points: Physical Divisions of India> The Coastal Plains
- India has a coastline of approximately 7,500 km, extending along the eastern (Bay of Bengal) and western (Arabian Sea) sides of the Peninsula, meeting at Cape Comorin.
- The Western Coastal Plains are narrow, rocky, and indented, with short rivers forming estuaries; major ports include Mumbai and Kochi.
- The Eastern Coastal Plains are broad and flat, formed by deposition from major rivers like the Mahanadi, Godavari, Krishna, and Kaveri, leading to fertile deltas.
- Subdivisions: East coast – Northern Circars and Coromandel Coast; West coast – Gujarat, Konkan, Kanara, Malabar.
- The coastal plains are important for ports, minerals (like salt and monazite), and fisheries.
Key Points: Physical Divisions of India> The Island Group
- India has two major island groups: the Lakshadweep Islands in the Arabian Sea and the Andaman & Nicobar Islands in the Bay of Bengal.
- The Lakshadweep Islands are mostly coral atoll islands, small, flat, and low in height, and lie off the Kerala coast.
- The Andaman & Nicobar Islands consist of many islands (about 265–300), mostly forested and hilly, and are separated by the Ten Degree Channel.
- Barren Island in the Andaman group has India’s only active volcano, and Indira Point in Great Nicobar is India’s southernmost point.
- These island groups are important for strategic location, biodiversity, and are surrounded by coral reefs and rich marine life.
Key Points: Rivers of Northern India VS Rivers of Peninsular India
| Western Coastal Plains | Eastern Coastal Plains |
|---|---|
| Formed by submergence | Formed by emergence & deposition |
| Narrow (≈ 64 km) | Broad (≈ 80–100 km) |
| Short rivers, no deltas | Long rivers, big deltas |
| Many natural ports | Few natural ports |
| Coast is highly indented | Coast is straight/linear |
Important Questions [2]
Concepts [15]
- Introduction of Location and Extent
- Physical Features of India
- Physical Division of India
- Significance of the Great Northern Wall
- Physical Division of India > North Indian Plains
- Western Himalayas VS Eastern Himalayas
- Significance of the Northern Plains
- Physical Division of India > The Peninsula
- Western Ghats VS Eastern Ghats
- Drainage System in the Peninsular India
- Physical Division of India > The Plateau Region
- Western Coastal Plains VS Eastern Coastal Plains
- Physical Division of India > The Coastal Plains
- Physical Division of India > The Island Group
- Rivers of Northern India VS Rivers of Peninsular India
