Geography

India lies entirely in the Northern and Eastern hemispheres. Latitudinal range: ~8°4′ N to ~37°6′ N; longitudinal: ~68°7′ E to ~97°25′ E. North–South extent: ~3,214 km; East–West: ~2,933 km

Total area: ~3.287 million km² (7th largest globally). Coastline length: ~7,516.6 km (mainland ~6,100 km). Land borders total ~15,200 km, shared with 7 countries. India shares longest frontier with Bangladesh

Andaman & Nicobar Islands: 572 islands (325+247) covering ~7,935 km². India's only active volcano: Barren Island (erupted 2017). Indira Point is the southernmost point (6°45′ N)

Inland navigable waterways: ~14,500 km. Major watersheds: Himalayan, Vindhya–Satpura, Western Ghats. Tropic of Cancer (23°30′ N) bisects India

India accounts for ~2.42% of world land area. India spans multiple climate zones: equatorial to alpine. Lies on the Indian Plate (part of Indo-Australian Plate)

India's islands share maritime borders with Myanmar, Thailand, Indonesia. Includes Sriharikota, Elephanta, Majuli (largest river island). Seven states share border with international frontiers

Extend ~2,400 km along northern India. Subranges: Siwaliks, Lesser Himalayas, Greater Himalayas. Contains 100+ peaks over 7,200 m; includes Everest (8,848 m). Formed by collision of Indian and Eurasian plates c. 55 Ma. Uplift rate: ~5 mm/year

~700,000 km² of fertile alluvium. Eastern Himalayan plains: densely populated, flood-prone. Ganges–Brahmaputra delta: world's largest, spread over India & Bangladesh. Major Himalayan rivers: Indus, Ganges, Brahmaputra

~200,000 km² (9th-largest hot desert). Spans Rajasthan, Gujarat, Punjab, Haryana, Sindh (Pakistan). 85% of Thar lies within India. Rann of Kutch: 27,900 km² salt marsh in Gujarat-Pakistan

Deccan Plateau, elevated by basalt flows. Western Ghats: ~1,600 km long, peak Anamudi (2,695 m). Eastern Ghats: discontinuous, lower altitude. Vindhya and Satpura ranges form central highlands

Coastal Plains: Eastern Coastal Plain (400 km), Western Coastal Plain (50–100 km). Islands: Lakshadweep (36 islands), Andaman & Nicobar (572 islands)

Perennial (snow-fed). Indus and tributaries: Jhelum, Chenab, Ravi, Beas, Sutlej (Punjab region). Ganges originates from Gangotri Glacier, Uttarakhand. Brahmaputra arises as Yarlung Tsangpo in Tibet

Godavari (Dakshin Ganga), Krishna, Cauvery, Narmada, Tapi. Narmada flows westwards between Vindhya and Satpura; Tapti similarly. Western Ghats rivers flow eastwards (deccan) or westwards (konkan)

Ganges Basin catchment: ~1.1 million km². Entire Indo-Gangetic ~1.6 million km². Flood-prone zones: Ganga–Brahmaputra delta, Brahmaputra valley. Sundarbans mangroves (UNESCO) in delta region

Hundreds of dams: Bhakra Nangal, Hirakud, Sardar Sarovar, Tehri. River islands: Majuli (Brahmaputra), world's largest. Inland waterways: Ganga, Brahmaputra, Sharavati, Krishna basin used for navigation

Monsoon rains feed river flow and recharge aquifers. Himalayan watersheds supply irrigation and hydro-power. Indo-Gangetic alluvium supports intensive agriculture. India's river systems interlinked by national waterways project

Range from tropical monsoon to alpine tundra. Four phenological seasons in Himalayas (summer, monsoon, autumn, winter, spring). Southwest monsoon (June–Sept): main rainy season. Western disturbances bring winter rain to northwest

Eastern coast cyclones frequent (Bay of Bengal). Eastern & Western Ghats cause orographic rainfall. Rain shadow on Deccan east of Western Ghats. Monsoon variability causes droughts/floods alternately

Biomes include tropical evergreen, moist deciduous, thorn forests, alpine meadows. Himalayan vegetation ranges from subtropical to alpine. Western Ghats are a major biodiversity hotspot; UNESCO declared 39 sites in 2012

Sundarbans hosts mangrove forests and Bengal tigers. Thar Desert vegetation: xeric shrubs, grasses. Deccan plateau: scrub and deciduous forests. Coastal vegetation: salt marshes, palms, casuarinas

Western Ghats shelter endemic species: Nilgiri tahr, many amphibians. Alpine pastures support nomadic grazing. Western and Eastern Ghats differ in geology and vegetation patterns. Indo-Gangetic plain supports intensive cropping

28 states and 8 Union Territories. NR states: Jammu & Kashmir, Himachal Pradesh… UT: Delhi, Chandigarh, etc. India's capital: New Delhi (NCT Delhi). Includes disputed territories JK, Ladakh, Aksai Chin, Arunachal North

Population (2023 est): ~1.429 billion; most populous nation. Population density rank: 30th globally. Major metros: Delhi NCR, Mumbai, Kolkata, Bengaluru, Pune, Hyderabad, Chennai

Borders Pakistan (3,323 km), China, Nepal, Bhutan, Bangladesh, Myanmar, Afghanistan (Ladakh). Maritime boundaries with Sri Lanka, Maldives, Indonesia, Thailand. India's Exclusive Economic Zone: ~2 million km²

Major states by area: Rajasthan, Madhya Pradesh, Maharashtra. Coastal states (9) cover mainland coast. Island UTs: A&N, Lakshadweep. Largest city by area: Delhi (1483 km²). Highest city: Shimla (~2,200 m)

Human development index ~0.685 (2023). Gini coefficient ~0.328 (2021). 22 scheduled languages, 1,600 dialects. India's time zone: IST (UTC +5:30); drives on left

7 continents; 5 oceans: Pacific, Atlantic, Indian, Southern, Arctic. Smallest country: Vatican City; largest: Russia. Highest waterfall: Angel Falls (Venezuela); longest river: Nile

Largest desert: Antarctic (cold); Sahara is largest hot desert. Largest island: Greenland; most lakes: Canada. Great Barrier Reef lies off Queensland, Australia. Dead Sea sits between Israel & Jordan

Equator divides Earth into hemispheres. Isthmus: narrow land linking continents; e.g., Panama. Mountain range between Europe & Asia: Ural Mountains. "Land of Rising Sun" refers to Japan

Earth's major layers: lithosphere, asthenosphere, mantle, core. Continents drifting: plate tectonics unified Pangaea to drift. Mid-ocean ridges create new oceanic crust; subduction recycles

Volcano types: shield, composite, cinder cone. Ring of Fire: Pacific Ocean basin with active volcano systems. Polar ice coverage: Arctic/Antarctic contain ~90% of glacial ice

Earth's axial tilt (23.5°) drives seasons. Equator receives most direct sunlight. Latitude vs Longitude: horizontal vs vertical. A valley between mountains is called a 'glen' or 'vale'

Plateau: elevated flat land (e.g., Deccan Plateau). Peninsula: land surrounded by water on 3 sides; India is major example. Delta: river mouth fan; e.g., Ganges–Brahmaputra. Isthmus: link between two large land masses

Monsoon-driven rain supports agriculture across South Asia. Orographic rain: forced uplift along hills (Western Ghats). Rain shadow forms leeward dry regions. Climate classification: Koppen system divides climates

Tectonic plates create mountains and cause earthquakes. Glacial landforms: cirques, U-shaped valleys, moraines. River landforms: meanders, oxbow lakes, floodplains. Soil types: alluvial, laterite, black, red, arid zone soils

~15% forest cover; classification: tropical, temperate, alpine. Major national parks: Jim Corbett, Sundarbans, Kaziranga. Western Ghats and Eastern Ghats extremely biodiverse

~160,000 km² area. Anamudi (2,695 m) tallest peak. Formed during Gondwana breakup (Jurassic/Cretaceous). Western Ghats shelter endemic species

Black cotton soil in Deccan from volcanic basalt. Alluvial soils in northmost plains very fertile. Laterite soils in high rainfall areas (Ghats). Arid soils dominate Thar Desert. Saline soils in Rann of Kutch region

Multiple mineral belts: coal belt, iron ore (Odisha). Mineral resources: coal, iron ore, bauxite, manganese, copper. Hydropower plants in Himalayan and Western Ghats rivers

Eastern coast hosts Mangalore, Vishakhapatnam ports. Western Indian ports: Mumbai, Kandla. Strategic Suez-Hormuz global chokepoints near India. India's Exclusive Economic Zone: rich in marine resources