Geography of India & World

🟢 Lite — Quick Review (1h–1d)

Rapid summary for last-minute revision before your exam.

India spans approximately 3.28 million square kilometres, making it the seventh-largest country in the world by area. It extends from Kashmir in the north to Kanyakumari in the south (roughly 3,214 km), and from Gujarat in the west to Arunachal Pradesh in the east (about 2,933 km). The Tropic of Cancer (23°30′ N) divides India into two sub-tropical zones. India shares land borders with Pakistan, China, Bhutan, Nepal, Myanmar, and Bangladesh, and maritime borders with Sri Lanka, Maldives, Indonesia, and Thailand.

The Himalayas form the northern mountain barrier, spanning approximately 2,400 km and comprising three parallel ranges: the Greater Himalayas (Himadri), Middle Himalayas (Himachal), and Outer Himalayas (Shiwaliks). The Himalayas include the world’s highest peaks — Mount Everest (8,849 m, in Nepal/China) and Kangchenjunga (8,586 m, India/Nepal). Major rivers of the Indo-Gangetic Plain include the Ganga, Yamuna, Brahmaputra, Ghaghara, and Gandak, which drain into the Bay of Bengal.

The Indian peninsula is bounded by the Arabian Sea on the west, the Bay of Bengal on the east, and the Indian Ocean on the south. The Indian subcontinent contains three major relief divisions: the Himalayan Mountains, the Indo-Gangetic Plain, and the Peninsular Plateau. India’s climate ranges from tropical monsoon in most regions to alpine in the Himalayas and arid in parts of Rajasthan and Gujarat.

⚡ Exam tip: SNAP Geography questions frequently test states, rivers, mountain ranges, and boundaries. Memorise the major rivers and the states they flow through. The Ganga-Brahmaputra delta (Sunderbans) is the world’s largest delta. Remember that India has 28 states and 8 union territories.

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🟡 Standard — Regular Study (2d–2mo)

Standard content for students with a few days to months.

Himalayan Ranges and Peaks

The Himalayas were formed by the collision of the Indian Plate with the Eurasian Plate approximately 50 million years ago — this is an ongoing process responsible for earthquakes in the region. The Greater Himalayas (Himadri) contain the highest peaks and are largely covered by snow year-round. Notable passes include Khardung La (in Ladakh), Nathu La (Sikkim-China border), and Zoji La (Kashmir). The Trans-Himalayan range lies north of the main Himalayan range and includes the Karakoram, Ladakh, and Zanskar ranges. K2 (Godwin-Austen, 8,611 m) is the second-highest peak in the world and is located on the India-Pakistan border in the Karakoram range.

Major Rivers and Their Basins

The Ganga Basin is India’s largest river basin, covering over 1 million square kilometres. The Ganga originates from the Gangotri Glacier at Gaumukh (Uttarakhand) and is joined by major tributaries including the Yamuna (at Triveni Sangam, Prayagraj), Ghaghara, Gandak, Kosi, and Son. The Brahmaputra originates in Tibet (where it is called Yarlung Tsangpo), enters India in Arunachal Pradesh as the Siang River, and is known as the Brahmaputra in Assam. The Godavari (1,465 km) is the longest river in peninsular India, originating in Maharashtra and draining into the Bay of Bengal near Rajahmundry. The Krishna, Mahanadi, Narmada, and Tapti are other major rivers.

The Narmada and Tapti are the only major west-flowing rivers of the peninsula, draining into the Arabian Sea. The Indus (Sindhu) originates in Tibet and flows through India (Ladakh), Pakistan, and finally into the Arabian Sea.

Climate Regions of India

India experiences six major climate types: Tropical Wet (Kerala, West Bengal), Tropical Dry (Madhya Pradesh, Odisha), Subtropical Humid (Northern plains), Mountain (Himalayan region), Arid (Rajasthan, Gujarat), and Semi-Arid (Deccan plateau, Punjab-Haryana). The monsoons — southwest and northeast — are the dominant weather system. The southwest monsoon (June–September) brings most of India’s rainfall. The northeast monsoon (October–December) affects primarily Tamil Nadu and coastal Andhra Pradesh. Kerala experiences the first onset of the southwest monsoon, typically around 1 June ( monsoon onset over Kerala).

States, Capitals, and Boundaries

India’s 28 states and 8 union territories are frequently tested in SNAP. Key state facts: Rajasthan is the largest state by area (342,239 sq km); Goa is the smallest. Uttar Pradesh is the most populous state; Lakshadweep is the smallest union territory by area. States sharing international borders include: Rajasthan (Pakistan), Gujarat (Pakistan), Punjab (Pakistan), Jammu & Kashmir (Pakistan, China), Arunachal Pradesh (China, Myanmar), Nagaland (Myanmar), Manipur (Myanmar), Mizoram (Myanmar, Bangladesh), Meghalaya (Bangladesh), Tripura (Bangladesh), and West Bengal (Bangladesh, Nepal).

Common traps in SNAP GK questions: Students often confuse which rivers originate in which states. The Brahmaputra is frequently misidentified as entirely Indian — it originates in Tibet. Remember that the Ganga-Brahmaputra system forms the world’s largest delta (the Sundarbans delta in West Bengal and Bangladesh). The Western Ghats and Eastern Ghats are often mixed up — the Western Ghats are taller, receive more rainfall, and run parallel to the western coast.

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🔴 Extended — Deep Study (3mo+)

Comprehensive coverage for students on a longer study timeline.

Peninsular Plateau and Mineral Wealth

The Peninsular Plateau is divided into the Central Highlands (Malwa, Bundelkhand, Chota Nagpur Plateau, Deccan Plateau) and the Northeastern Highlands. The Deccan Plateau is a large volcanic flood basalt region covering most of South India, formed by Deccan Traps lava flows some 66 million years ago. The Chota Nagpur Plateau in Jharkhand is India’s richest mineral belt, containing vast reserves of mica, coal, iron ore, copper, and bauxite. The Koderma Forest in Jharkhand is known for its mineral resources. The Western Ghats (Sahyadri) span approximately 1,600 km from Gujarat to Tamil Nadu, are recognised as a UNESCO World Heritage Site, and are one of the eight “hottest” biodiversity hotspots in the world.

Indian Ocean and Coastal Features

India’s coastline spans approximately 7,517 km, making it the 15th longest coastline in the world. The western coast is characterised by the Kathiawar Peninsula (Gujarat), Konkan strip (Maharashtra-Goa), and Malabar Coast (Karnataka-Kerala). The eastern coast features the Coromandel Coast (Tamil Nadu) and the Circar Coast (Andhra Pradesh-Odisha). Major ports include Jawaharlal Nehru Port (JNP) in Mumbai — India’s largest container port — along with Mundra (Gujarat), Chennai, Kolkata, Visakhapatnam, and Cochin.

Island Territories

India’s island territories include the Andaman and Nicobar Islands (Bay of Bengal) and Lakshadweep Islands (Arabian Sea). The Andaman and Nicobar group contains over 570 islands, with Port Blair as the capital. The Indira Point (Great Coco Island) at 6°45′ N is India’s southernmost point. The Lakshadweep group comprises 36 islands covering 32 sq km, with Kavaratti as the capital. The coral atolls of Lakshadweep are fringing reefs formed on submerged ridges.

World Geography — Continents, Oceans, and Key Landmarks

The world has seven continents: Asia (largest, 44.58 million sq km), Africa (second largest), North America, South America, Antarctica, Europe, and Australia (smallest). The five oceans are Pacific (largest), Atlantic, Indian, Southern (Antarctic), and Arctic (smallest). Major mountain ranges include the Andes (South America, longest continental mountain range at 7,000 km), the Himalayas (Asia), the Rockies (North America), the Alps (Europe), and the Ural Mountains (often considered the boundary between Europe and Asia).

The Strait of Hormuz (between Oman and Iran) is a critical oil shipping route. The Suez Canal (Egypt, 1869) connects the Mediterranean Sea to the Red Sea. The Panama Canal (Panama, 1914) connects the Atlantic and Pacific Oceans. The Bering Strait separates Asia (Russia) from North America (Alaska).

Soils and Agriculture

India has six major soil types: Alluvial soil (Indo-Gangetic plain, most fertile), Black soil (Regur, Deccan trap basalt, cotton-growing), Red soil (metamorphic rocks of South India), Laterite soil (high rainfall areas, leached), Forest soil (mountain slopes), and Desert soil (arid regions). The Indo-Gangetic Plain is one of the most fertile agricultural regions in the world, producing wheat, rice, sugarcane, and cotton.

Dams and Water Resources

India has over 5,200 large dams, with Sardar Sarovar Dam (Narmada, Gujarat) being one of the largest. Hirakud Dam (Mahanadi, Odisha) is one of the longest dams in the world. Tehri Dam (Bhagirathi, Uttarakhand) is India’s highest dam and among the tallest in Asia.

SNAP-specific question patterns: SNAP Geography questions emphasise Indian geography over world geography. Focus on the mapping of rivers to states, mountain ranges to their locations, and climate types to their regions. Questions pairing soil types with their agricultural products and mineral locations with their states are common. Watch for questions linking rivers to the cities they pass through — for instance, Varanasi on the Ganga, Hyderabad on the Musi (now diverted), and Kolkata on the Hooghly distributary.