Geography & Environment
🟢 Lite — Quick Review
Geography and Environment in MAT typically contributes 6–8 questions, testing candidates on India’s physical diversity, river systems, climate patterns, biodiversity, mineral distribution, and current environmental challenges. The subject requires spatial understanding — knowing where features are located is as important as knowing what they are. Map-based questions frequently appear, asking candidates to identify which state contains a particular river, mountain range, or mineral deposit.
Key facts to memorise:
- Himalayas: Three parallel ranges — Himadri (Greater Himalayas, altitude 6,000–8,849m, continuous snow cover), Himachal (Lesser Himalayas, 3,500–4,500m, major hill stations), and Shivalik (Outer Himalayas, 900–1,500m, unconsolidated sediments). Major passes include Khardung La (5,359m, Jammu & Kashmir), Rohtang La (3,978m, Himachal Pradesh), and Nathu La (4,310m, Sikkim-China border)
- Major rivers: Ganga (Devprayag, Uttarakhand — Bhagirathi joins Alaknanda; enters Bengal as Hooghly and Padma), Brahmaputra (originates in Tibet, enters India in Arunachal Pradesh as Dihang; joins Ganga in Bangladesh to form Meghna), Godavari (second longest peninsular river, called “Dakshina Ganga”, origin near Nashik, Maharashtra), Narmada (largest west-flowing river, origin at Amarkantak, Madhya Pradesh)
- Monsoon: Southwest monsoon (June–September) brings 75% of India’s rainfall; retreating monsoon (October–November) affects Tamil Nadu; Mawsynram and Cherrapunji (Meghalaya) receive 11,000+ mm annual rainfall — world’s wettest places
- Tiger reserves: 54 reserves; India has approximately 3,167 tigers (2023 census, census conducted every 4 years)
- Biodiversity hotspots: Himalayas, Western Ghats, Sundarbans, Indo-Burma region
- Environmental issues: Delhi-NCR air pollution (stubborn burning, vehicular emissions); climate change and India’s NDCs under Paris Agreement; wetland conservation
⚡ MAT Exam Tip: In 150 minutes for 100 questions, spend no more than 2 minutes per GK question. For geography, create mental associations: “Mithun’s elephant” — Madhya Pradesh has both Kanha (tiger) and Kaziranga (one-horned rhinoceros) is Assam; Bandipur and Nagarhole are adjacent Karnataka reserves. Map-based questions frequently ask which state a UNESCO site or major river passes through — practise on blank maps until you can locate features without reference.
🟡 Standard — Regular Study
Physical Geography of India
Geological Background:
India’s geological record spans approximately 4.5 billion years, with the subcontinent’s core — the Indian Shield or Peninsular Block — representing one of Earth’s most ancient stable continental masses. The Himalayas, by contrast, are geologically young mountains formed during the Tertiary period (25–50 million years ago) through the collision of the Indian Plate with the Eurasian Plate. This collision, which began when the Indian Plate separated from Gondwana and drifted northward at an estimated 15–20 cm per year, caused the Tethys Sea between the two landmasses to close, sediments to fold and uplift, and the Tibetan Plateau to rise to its current altitude.
The Himalayas remain tectonically active, evidenced by regular seismic activity in the Northeast region (Arunachal Pradesh, Assam, Sikkim) and the 2015 Nepal earthquake (7.8 magnitude) which killed nearly 9,000 people. The Indo-Gangetic Plain, formed by sediment deposition from Himalayan rivers over millions of years, constitutes one of the world’s most fertile agricultural zones — but sits on deep alluvial deposits that amplify earthquake vibrations.
Mountain Systems of India:
The Himalayan System (North):
The Himalayas extend 2,500 km as an arc from the Indus River in Pakistan to the Brahmaputra in Assam, spanning 5 Indian states (Jammu & Kashmir, Himachal Pradesh, Uttarakhand, Sikkim, Arunachal Pradesh) plus Nepal and Bhutan.
- Himadri (Greater Himalayas): The highest and most continuous range, with peaks above 6,000m remaining perpetually snow-covered. Major peaks include Mount Everest (8,849m, Nepal-China border, the world’s highest), K2 (8,611m, Pakistan-administered Kashmir, the world’s second-highest), Kangchenjunga (8,586m, India-Nepal border, India’s highest peak), and Nanda Devi (7,816m, Uttarakhand, India’s second-highest). The Greater Himalayas contain the Ganges, Yamuna, and Bhagirathi river sources.
- Himachal (Lesser Himalayas): Altitude 3,500–4,500m; characterised by well-developed hill stations including Shimla, Mussoorie, Nainital, Darjeeling, and Gangtok. The region is heavily forested and prone to landslides during monsoons.
- Shivalik Hills (Outer Himalayas): The youngest range, altitude 900–1,500m; composed of unconsolidated sediments (sandstone, gravel, clay) deposited by Himalayan rivers. These hills extend from Jammu in the west to Assam in the east and are prone to flash floods.
The Western Ghats (Sahyadri):
Running along India’s western edge for 1,600 km from the Tapi River (Gujarat) to Kanyakumari (Tamil Nadu), the Western Ghats form the Western Ghats-Sri Lanka biodiversity hotspot (one of the world’s 36 global hotspots). The range is continuous except for the Palakkad Gap (also called the Palghat), a 40km break separating Kerala from Tamil Nadu that serves as a crucial migration corridor for species and the route for the existing railway line.
The Western Ghats create orographic rainfall — when the Southwest monsoon winds from the Arabian Sea hit the Western Ghats, they rise, cool, and release moisture, causing heavy rainfall on the windward side (Kerala, Maharashtra, Goa, Karnataka) and a rain shadow on the leeward side (interior Deccan, Telangana, Marathwada). Anamudi (2,695m, Kerala) is the highest peak in peninsular India; Doddabetta (2,637m, Tamil Nadu) is the highest in the Nilgiri Hills.
The Eastern Ghats:
Discontinuous hill chains along India’s eastern edge, lower in altitude and more eroded than the Western Ghats. Major peaks include Mahendragiri (1,501m, Odisha), Arma Konda (1,680m, Andhra Pradesh), and Deomali (1,672m, Odisha). The Eastern Ghats do not create significant orographic rainfall, and the region receives rainfall primarily from the retreating monsoon and Bay of Bengal depressions.
River Systems and Drainage Patterns
Himalayan (Perennial) Rivers:
The Ganga River system originates in the Gangotri glacier in Uttarakhand where the Bhagirathi (named after King Bhagirath who performed austerities to bring the Ganga to earth) and Alaknanda converge at Devprayag to form the Ganga. The Yamuna, the Ganga’s largest tributary, originates at the Yamunotri glacier and joins the Ganga at Triveni Sangam in Allahabad (Prayagraj). Major Ganga tributaries include the Ghaghara (from Tibet), Gandak (from Nepal), Kosi (from Nepal — known as India’s “Sorrow” for devastating floods), and Son (from Madhya Pradesh).
The Brahmaputra originates in Tibet (where it is called the Yarlung Tsangpo) from the Chemayungdung glacier near Mount Kailash. It enters India in Arunachal Pradesh as the Dihang, receives tributaries including the Dibang and Lohit, then flows through Assam as the Brahmaputra before crossing into Bangladesh where it merges with the Ganga to form the Meghna, ultimately draining into the Bay of Bengal.
Peninsular Rivers — East Flowing:
The Mahanadi (originating in Chhattisgarh, Hirakud Dam) drains into the Bay of Bengal through Odisha. The Godavari, India’s second-longest river at 1,465 km, originates near Trimbak in Nashik district, Maharashtra, and flows through Telangana and Andhra Pradesh before emptying into the Bay of Bengal near Rajahmundry. Its major tributaries include the Purna, Indravati, Sabari, and Manjira. The Krishna originates at Mahabaleshwar in Maharashtra’s Satara district, flows through Karnataka and Andhra Pradesh, with major tributaries including the Koyna (which created Koyna Dam, India’s largest hydroelectric project), Tungabhadra, and Bhima. The Kaveri (Cauvery) originates in Karnataka’s Coorg district at Brahmagiri range, flows through Tamil Nadu, and creates the Hogenakkal Falls before reaching the KRS Dam (Krishnarajasagara).
Peninsular Rivers — West Flowing:
The Narmada, India’s fifth-longest river at 1,312 km, originates at Amarkantak in Madhya Pradesh’s Anuppur district and flows west through the marble rocks of Bhedaghat (Jabalpur district), into Gujarat where it forms the Gulf of Khambhat before entering the Arabian Sea. The Sardar Sarovar Project (Narmada) is a major multi-purpose dam. The Tapti parallels the Narmada, flowing through Maharashtra, Gujarat, and Madhya Pradesh with tributaries including the Purna, Bori, and Panzara.
Climate and Monsoon System
India’s climate is dominated by the monsoon — a seasonal reversal of wind patterns caused by differential heating of the Asian landmass and the Indian Ocean. The Intertropical Convergence Zone (ITCZ), where northern and southern hemisphere trade winds meet, plays a critical role.
Southwest Monsoon (June–September):
Two branches hit India. The Arabian Sea branch strikes the Western Ghats, producing heavy orographic rainfall — the windward slopes of Maharashtra’s Western Ghats receive 2,500–3,000 mm during this season. The Bay of Bengal branch enters through Northeast India (Assam), strikes the Meghalaya plateau (causing the extraordinary rainfall at Mawsynram and Cherrapunji — Mawsynram averages 11,873 mm annually), then moves westward along the Himalayan foothills, depositing heavy rainfall in Bihar and Uttar Pradesh.
The monsoon normally arrives at Kerala’s coast around 1 June (with a standard deviation of about a week) and covers the entire country by mid-July. The date of monsoon onset is significant for agricultural planning (kharif sowing) and is officially declared by the India Meteorological Department (IMD).
Retreating Monsoon (October–November):
The Southwest monsoon begins retreating in September as the sun’s heating shifts southward, creating a monsoon trough that moves south. Northeast monsoon (winter monsoon) affects Tamil Nadu, coastal Andhra Pradesh, and Rayalaseema during October–December, bringing 40–60% of Tamil Nadu’s annual rainfall. Cyclones forming in the Bay of Bengal during this period frequently strike Odisha and Andhra Pradesh — Cyclone Fani (May 2019) and Cyclone Amphan (May 2020, the first super cyclone over Bay of Bengal in the 21st century) caused enormous destruction.
Köppen Climate Classification:
India exhibits multiple climate types: Am (tropical monsoon — Kerala, parts of Assam), As/Aw (tropical savanna — most of peninsular India, interior), BSh/BWh (semi-arid/hot desert — Thar Desert, Rajasthan, Gujarat), Cwg (monsoon with dry winter — parts of Odisha, West Bengal), Dfc (subalpine — Sikkim, Arunachal Pradesh), and ET/E (alpine/tundra — high Himalayas above snowline).
Biodiversity and Conservation
Bio-geographic Zones:
India spans ten distinct bio-geographic zones — the greatest diversity of any country in the world: Trans-Himalayan (cold desert of Ladakh, Lahaul-Spiti), Himalayan (Jammu & Kashmir through Arunachal Pradesh), Desert (Thar in Rajasthan, Rann in Gujarat), Semi-Arid (Punjab, Haryana, Gujarat), Western Ghats and Sri Lanka (the only global hotspot that includes another nation), Gangetic Plain (Indus-Ganga-Brahmaputra alluvial plains), North-East (Assam, Meghalaya, Nagaland, and the seven sisters), Coastal (Western and Eastern coasts plus islands), and Deccan Peninsula (central India south of the Ganges).
Protected Area Network:
India maintains 104 national parks (covering 43,715 sq km), 566 wildlife sanctuaries, and 18 biosphere reserves (11 designated UNESCO World Network of Biosphere Reserves). Project Tiger, launched in 1973, now covers 54 tiger reserves — India’s wild tiger population has recovered from approximately 1,800 in 2006 to 3,167 in 2023 (2023 census). Project Elephant (1992) covers 33 elephant reserves across 13 states.
Major protected areas include Jim Corbett National Park (Uttarakhand, established 1936 — India’s oldest national park, named after hunter-turned-conservationist Jim Corbett who documented man-eaters), Kaziranga National Park (Assam, home to two-thirds of the world’s one-horned rhinoceroses, 2,613 individuals as of 2023 census), Bandipur (Karnataka, part of Nilgiri Biosphere Reserve), Kanha (Madhya Pradesh, inspiration for Rudyard Kipling’s The Jungle Book), Periyar (Kerala), Silent Valley (Kerala — last remaining tropical evergreen forest in the Western Ghats), Hemis (Ladakh — snow leopard habitat), and Sundarbans (West Bengal — largest mangrove forest in the world, UNESCO World Heritage Site, home to the Bengal tiger adapted to mangrove ecosystem).
🔴 Extended — Deep Study
Agriculture and Soil Types
India’s agricultural geography reflects the interaction of climate, topography, soil, and historical irrigation patterns.
Major Soil Types:
-
Alluvial Soil: Deposited by Himalayan rivers across the Indo-Gangetic Plain (Punjab, Haryana, Uttar Pradesh, Bihar, West Bengal). Two varieties — Khadar (newer, sandy, light-coloured, more permeable) and Bhangar (older, clayey, darker, retains moisture). Extremely fertile, supporting wheat, rice, sugarcane, cotton, and jute. This is India’s most productive agricultural soil.
-
Black Soil (Regur): Formed from Deccan Traps (ancient volcanic lava flows) across Maharashtra, Madhya Pradesh, Gujarat, Telangana, and Karnataka. Rich in iron, magnesium, calcium, and potash but deficient in nitrogen and phosphorus. Its characteristic property is self-ploughing — when wet, the clay swells; when dry, it cracks deeply, aerating the soil. Ideal for cotton (cotton-growing black soil is called “black cotton soil”), soyabean, and pulses.
-
Red Soil: Derived from crystalline granite and gneiss in eastern and southern India (Tamil Nadu, Karnataka, Andhra Pradesh, Odisha). Red colour comes from iron oxide (haematite); deficient in nitrogen, phosphorus, humus, and moisture-holding capacity. Rice, wheat, sugarcane, and coarse grains grow here.
-
Laterite Soil: Formed through heavy leaching (rainfall washing away silica) in the Western Ghats, Eastern Ghats, Odisha, Assam, and the Chota Nagpur Plateau. Heavy iron and aluminium oxide content gives the red colour; heavily weathered and unsuitable for most crops except tea, coffee, rubber, cashew, and coconut.
-
Mountain Soil: Found in Himalayan regions; immature, mixed with stones and boulders; supports forests and terraced agriculture.
-
Desert Soil: Sandy soils of Rajasthan, Gujarat — very low organic matter, high phosphate and nitrate content, but low moisture. Only drought-resistant crops ( Bajra, pulses) can grow here; canal irrigation enables cultivation of wheat and cotton.
Agricultural Seasons:
India follows a three-season agricultural calendar. Kharif (June–October) coincides with the Southwest monsoon — rice, cotton, jute, maize, groundnut, soyabean, and arhar (pigeon pea) are major kharif crops. Rabi (October–March) uses winter rainfall and residual soil moisture — wheat, barley, mustard, peas, chickpeas (chana), and lentil are major rabi crops. The Zaid (March–June) is a short summer season between rabi and kharif — watermelon, cucumber, fodder crops, and some vegetables are grown, particularly in irrigated areas.
The Green Revolution (beginning in the 1960s in Punjab, Haryana, and Western Uttar Pradesh) introduced high-yielding varieties of wheat and rice, chemical fertilisers, pesticides, irrigation, and modern machinery, transforming India from a food-deficit nation to a surplus producer. However, it also created regional inequalities (benefits concentrated in well-irrigated areas) and environmental concerns (water table depletion, soil salinity, chemical runoff).
Mineral Resources and Distribution
India’s mineral wealth is concentrated in three major geological zones.
Chota Nagpur Plateau (Eastern India):
This region spanning Jharkhand, West Bengal, Odisha, and Chhattisgarh is India’s richest mineral belt. Singhbhum (Jharkhand) contains one of the world’s richest iron ore deposits (haematite with 60–68% iron content). The Jharia and Raniganj coalfields supply coking coal for India’s steel industry. Koderma and Gaya districts in Jharkhand are India’s principal mica-producing areas (used in electronics and cosmetics). Singhbhum also has copper mines. Balaghat in Madhya Pradesh produces manganese, and Odisha’s Kalahandi and Koraput districts have significant bauxite deposits.
Deccan Plateau:
The Deccan Traps and associated geological formations contain manganese (Nagpur and Balaghat in Madhya Pradesh, which together produce 90% of India’s manganese), coal in the Godavari valley (Singareni coalfield in Telangana), and limestone (Madhya Pradesh, Andhra Pradesh, Rajasthan). The Bellary-Hospet region in Karnataka has significant iron ore deposits.
Aravalli Range (Rajasthan):
The Aravalli Range, one of India’s oldest mountain ranges (formed approximately 2.5 billion years ago), contains copper, lead, zinc (at Zawar, Bhilwada, and Rajsamand — Rajasthan produces 90% of India’s zinc), marble (Rajasthan is India’s largest marble producer), sandstone, and tungsten at Degana.
Coastal Beach Sands:
Kerala, Tamil Nadu, and Andhra Pradesh contain beach sands rich in heavy minerals including ilmenite (used in pigment production and as feedstock for titanium dioxide), rutile, zircon, and monazite (a source of rare earth elements and thorium for nuclear energy). Kerala’s Kollam and Thiruvananthapuram coasts are particularly rich.
Environmental Challenges
Climate Change:
India, despite contributing only about 7% of global cumulative CO2 emissions (as of 2023), is among the most climate-vulnerable countries. Projected impacts include reduced agricultural yields (wheat yields could fall 6–23% by 2050), increased frequency of extreme weather events (cyclones, floods, droughts), Himalayan glacier melt threatening river flows, and sea-level rise threatening coastal cities including Mumbai, Kolkata, and Chennai.
India’s commitments under the Paris Agreement (2015) include reducing emission intensity of GDP by 33–35% from 2005 levels by 2030, achieving 40% cumulative electric power installed capacity from non-fossil fuel sources by 2030, and creating an additional carbon sink of 2.5–3 billion tonnes of CO2 equivalent through forest cover. India’s updated NDC (2022) raised ambition to 50% renewable energy by 2030. India has also announced a target of net-zero emissions by 2070.
The National Action Plan on Climate Change (NAPCC) launched in 2008 outlines eight missions including the Jawaharlal Nehru National Solar Mission (targets 100 GW solar capacity by 2022 — achieved in 2022) and the National Mission for Enhanced Energy Efficiency.
Air Pollution:
Delhi-NCR consistently ranks among the world’s most polluted urban areas. The primary pollution sources are agricultural stubble burning in Punjab and Haryana (contributing 15–40% of Delhi’s winter PM2.5 levels), vehicular emissions (aerosols and nitrogen oxides), industrial pollution, construction dust, and thermal inversion during winter (a meteorological phenomenon where cold air trapped below warmer air prevents pollutant dispersion).
The Graded Response Action Plan (GRAP) implements four stages of anti-pollution measures based on Air Quality Index: Stage I (Poor, AQI 201–300) activates road dust management and waste burning restrictions; Stage II (Very Poor, AQI 301–400) adds construction bans and truck entry restrictions; Stage III (Severe, AQI 401–450) introduces odd-even vehicle rationing and disables pre-2006 diesel vehicles; Stage IV (Severe+, AQI 450+) halts construction activities and restrictsBS-III petrol and BS-IV diesel vehicles.
The National Clean Air Programme (NCAP, 2019) targets 30% particulate matter reduction in 102 cities by 2024 (from 2017 levels). Annual budget for NCAP is approximately ₹4,400 crore.
Water Pollution and Management:
Major pollution sources include industrial effluents (textile, leather, chemical, and paper industries are worst offenders; the Ganga alone receives wastewater from 764 drains), agricultural runoff carrying pesticides and fertilisers (nitrate and phosphate pollution leading to eutrophication), and untreated sewage (India treats only 30–35% of its sewage). The Namami Gange Programme (₹20,000 crore, launched 2014) aims to reduce pollution and rejuvenate the Ganga through sewage treatment plant construction, river surface cleaning, industrial effluent monitoring (all 764 gross polluting industries on Ganga banks comply with standards), and biodiversity conservation.
India’s International Boundaries
India shares a 15,106 km land border with seven countries: Pakistan (3,323 km, disputed Kashmir region with Line of Control since 1949), China (3,488 km, disputed Aksai Chin administered by China and Arunachal Pradesh claimed by China as “South Tibet”), Nepal (1,751 km, open border with free movement), Bhutan (699 km, closest ally with India-managing defence), Bangladesh (4,096 km, the longest Indian border, resolved Land Boundary Agreement in 2015 exchanging 111 enclaves), Myanmar (1,643 km, dense jungle border with Naga insurgents), and Afghanistan (106 km via Pakistan-occupied Kashmir, narrow border).
Notable boundary disputes include Siachen Glacier (the world’s highest battleground, at approximately 5,000 metres, where India and Pakistan have deployed troops since 1984), Aksai Chin (a 37,555 sq km territory in Ladakh administered by China but claimed by India as part of Jammu & Kashmir), and the Doklam plateau (a tri-junction area between India, China, and Bhutan where a 73-day standoff occurred in 2017).
Content adapted based on your selected roadmap duration. Switch tiers using the selector above.