Skip to main content
Karnataka Specific 3% exam weight

Physical Geography of Karnataka

Part of the KPSC KAS study roadmap. Karnataka Specific topic karnat-001 of Karnataka Specific.

→ See in Roadmap Build 1-Month Plan

Physical Geography of Karnataka

🟢 Lite — Quick Review (1h–1d)

Rapid summary for last-minute revision.

Physical Geography of Karnataka — Key Facts for KPSC KAS • Location: Between 11°30’N and 18°45’N latitudes and 74°E and 78°30’E longitudes; lies entirely in Peninsular India; total area: 1,91,791 sq km (7th largest state). • Neighbours: Maharashtra (north), Goa (northwest), Andhra Pradesh (east), Tamil Nadu (southeast), Kerala (south and southwest); Lakshadweep Sea to west. • Physiographic divisions: Northern Karnataka Plateau (semi-arid, undulating plateau), Central Karnataka Plateau (transitional zone), Southern Karnataka Plateau (more elevated, forested), Coastal Plain (Western Ghats to Arabian Sea). • Western Ghats: Runs along western border; UNESCO World Heritage (2012); average elevation: 900-1,800 m; passes: Palakkad Gap (most significant — links Karnataka with Kerala/Tamil Nadu). • Major rivers: Krishna (flows east from Mahabaleshwar, Maharashtra), Tungabhadra (tributary of Krishna — major in Karnataka), Cauvery (rises in Kodagu, flows east to Tamil Nadu), Sharavathi (falls at Jog Falls — 253 m, 2nd highest in India after Nohkalikai). • Coastline: 320 km along Arabian Sea; major ports: Mangalore (New Mangalore Port) — 4th largest in India; Karwar (naval and commercial).

⚡ Exam tip: KPSC KAS frequently asks about Karnataka’s rivers and their importance, Western Ghats, and the Jog Falls. Questions on drainage patterns, regional climate variations, and geographical divisions within Karnataka are common.

🟡 Standard — Regular Study (2d–2mo)

Standard content.

Physical Geography of Karnataka — KPSC KAS Study Guide

Karnataka’s Physical Features

Relief and Physiographic Divisions

Karnataka exhibits remarkable geographical diversity from the coastal lowlands to the elevated Deccan plateau:

Northern Karnataka Plateau:

  • Districts: Bijapur, Gulbarga, Raichur, Koppal, Bellary, Yadgir
  • Rainfall: 500-700 mm (semi-arid; drought-prone)
  • Terrain: Undulating black soil plateau (Deccan Trap basalt)
  • Rivers: Krishna, Bhima
  • Major crops: Jowar, cotton, groundnut, pulses

Central Karnataka Plateau:

  • Districts: Dharwad, Haveri, Gadag, Shimoga, Davanagere
  • Rainfall: 700-1000 mm
  • Terrain: Transitional zone; mixed red and black soils
  • Rivers: Tungabhadra (with its dam — Tungabhadra Dam at Hampi)
  • Major crops: Cotton, jowar, sugarcane, rice

Southern Karnataka Plateau:

  • Districts: Mysore, Hassan, Mandya, Ramanagara, Tumkur, Bangalore Rural
  • Rainfall: 700-1000 mm (bimodal pattern)
  • Terrain: Granite and gneissic hills; rolling plains
  • Rivers: Cauvery, Arkavathi (tributary)
  • Crops: Ragi, rice, mulberry sericulture

Coastal Plain (Malenadu):

  • Districts: Uttara Kannada, Dakshina Kannada, Udupi
  • Rainfall: 2000-3000 mm (heavy monsoon)
  • Terrain: Narrow coastal strip between Western Ghats and Arabian Sea
  • Rivers: Sharavathi (Jog Falls), Netravati, Mahi
  • Vegetation: Tropical evergreen and semi-evergreen forests

Western Ghats in Karnataka

Extent in Karnataka:

  • Runs along entire western border from Goa to Kerala
  • UNESCO World Heritage (2012) — first in Karnataka (Western Ghats inscribed as serial property across states)
  • Average elevation: 900-1,800 metres

Important Passes:

  • Palakkad Gap: Most significant pass; connects Karnataka’s interior to Kerala; National Highway 544 passes through; altitude 100-150 m
  • Dakshina Kannada passes: Various smaller passes connecting coastal districts to interior

Mountain Ranges (Karnataka):

  • Western Ghats: Continuous barrier
  • Aravali remnants: In Karnataka (the Bargujjar hills of Karnataka are sometimes considered extensions)
  • Karnataka Highlands: Distinctive elevated plateau

Western Ghats Biodiversity:

  • Biodiversity hotspot: One of the world’s 36 biodiversity hotspots
  • Endemic species: Lion-tailed Macaque, Malabar Giant Squirrel, Malabar Trogon
  • Kodagu (Coorg) is part of the Western Ghats; global significance for biodiversity

Major Rivers and Drainage

Krishna River System:

  • Krishna proper: Rises from Mahabaleshwar (Maharashtra); flows through Karnataka for 400+ km
  • Major tributaries within Karnataka: Bhima (from Pune region), Tungabhadra (from Karnataka itself — formed by two streams in Karnataka)
  • Tungabhadra Dam (Hampi): Built across Tungabhadra; major irrigation project

Cauvery River System:

  • Rises from Talacauvery in Kodagu (Brahmagiri range, Western Ghats); altitude 1,340 m
  • Flows through Kodagu, Mysore, Karnataka-Tamil Nadu border
  • Major tributaries in Karnataka: Arkavathi (rises near Bangalore), Kabini (tributary from Wayanad, Kerala)
  • KRS (Krishnarajasagara) Dam (1914): Built across Cauvery near Mysore; one of India’s oldest major dams

Sharavathi River:

  • Flows from the Western Ghats to the Arabian Sea
  • Famous for Jog Falls (253 metres) — India’s 2nd highest waterfall after Nohkalikai (Meghalaya, 335m)
  • Kodagu’s rivers: Netravati, etc. flow west to Arabian Sea

Coastal Karnataka

Coastal Features:

  • 320 km coastline on the Arabian Sea
  • Mangalore (New Mangalore Port): India’s 4th largest port; handles iron ore exports, crude oil imports, container cargo
  • Karwar: Naval base and commercial port; significant during Portuguese, Dutch, British periods
  • Udupi and Malpe: Minor ports; fishing harbours

Coastal Erosion:

  • Significant coastal erosion in Uttara Kannada (Kumta, Honnavar areas)
  • 30% of coastline showing erosion
  • Mangalore and Udupi areas also affected

🔴 Extended — Deep Study (3mo+)

Comprehensive coverage.

Physical Geography of Karnataka — Comprehensive KPSC KAS Notes

Climate, Soil, and Natural Resources

Regional Climate Variations

Karnataka’s climate varies dramatically from coast to interior due to the Western Ghats:

Coastal Karnataka (Malenadu):

  • Tropical monsoon climate; heavy rainfall (2000-3000 mm annually)
  • Humidity: High throughout the year
  • Vegetation: Tropical evergreen and semi-evergreen forests; dense canopy
  • Tourism: Gokarna beaches, Murudeshwar temple, Udupi beaches

Interior Karnataka — Southwest (Mysore region):

  • Tropical savanna climate; moderate rainfall (700-1000 mm)
  • Distinct wet and dry seasons
  • Vegetation: Deciduous forests; dry deciduous in north

Interior Karnataka — North (Hyderabad-Karnataka):

  • Semi-arid climate; low and unreliable rainfall (500-700 mm)
  • Frequent droughts; desert-like conditions in Gulbarga, Raichur, Bijapur districts
  • Vegetation: Scrubland; thorny species

Bangalore’s Climate:

  • Elevation: 920 metres above sea level; pleasant climate
  • Temperature: 12-36°C annual range; summer (March-May) hot but moderate; winter cool
  • Referred to as “Garden City” historically; now facing water crisis

Soils of Karnataka

Black Cotton Soil (Regur):

  • Distribution: North Karnataka (Bijapur, Gulbarga, Raichur, Koppal, Bellary)
  • Parent material: Deccan Trap basalt
  • Properties: High clay content; swells when wet, shrinks when dry; good water retention
  • Agricultural significance: Cotton, jowar, groundnut; drought-resistant when managed properly

Red Sandy Soils:

  • Distribution: Mysore plateau, Kolar, Tumkur, Hassan districts
  • Parent material: Granite, gneiss
  • Properties: Low water retention; require fertilizers; good for dryland crops
  • Agricultural significance: Ragi, groundnut, pulses

Laterite Soils:

  • Distribution: Western Ghats foothills (Uttara Kannada, Dakshina Kannada, Chikmagalur)
  • Properties: Gravelly; leached; acidic; poor fertility
  • Agricultural significance: Tea, coffee, spices (Western Ghats zones); require heavy fertilization

Alluvial Soils:

  • Distribution: River valleys (Krishna, Tungabhadra, Cauvery, Sharavathi)
  • Properties: Fertile; loamy; good water retention
  • Agricultural significance: Rice, sugarcane, vegetables

Natural Resources

Mineral Wealth in Karnataka:

  • Iron ore (Bellary-Hospet-Sandur region): One of India’s major iron ore belts; 63%+ Fe grade
  • Manganese (North Karnataka): Found in Sandur hills; used in steel production
  • Gold (Kolar Gold Fields — historical, now closed; Hutti Gold Mine — still operating in Raichur district)
  • Limestone (Karnataka): Cement production
  • Magnesite (Mysore region — Krishnarajanagara): Refractory for steel industry; pharmaceutical uses

Forest Resources:

  • Forest cover: 38,000 sq km (20% of state area)
  • Forest types: Tropical evergreen (Western Ghats), moist deciduous, dry deciduous, scrub
  • Major forests: Bandipur, Nagarhole, Bhadra, Kudremukh (National Parks)
  • Endemic species: Lion-tailed Macaque (Karnataka’s endemic primate), Malabar Giant Squirrel, Malabar Trogon

Water Resources:

  • Major reservoirs: KRS (Krishnarajasagara), Tungabhadra Dam, Upper Krishna Project (Karnataka), Kabini Dam
  • Groundwater: Significant in granite areas; declining in Bangalore’s peripheral areas
  • Jog Falls (Sharavathi River): 253 m high; hydroelectric power generation (KPCL — Karnataka Power Corporation)

Environmental Issues in Karnataka

Coastal Erosion:

  • Karwar, Kumta, Honnavar, Mangalore beaches showing erosion
  • Sea walls built but limited effectiveness
  • National Green Tribunal orders to protect coast

Western Ghats — Conservation Challenges:

  • Ecological concern: Karnataka’s Western Ghats section faces mining pressure (Karnataka’s iron ore belt in Bellary extends to Western Ghats)
  • Ecological sensitive zones (ESZ): Ecologically sensitive areas declared; construction restrictions
  • Biodiversity protection: Protected areas network (National Parks, Wildlife Sanctuaries)

Bangalore’s Urban Environmental Crisis:

  • Water depletion: Cauvery supply limited; groundwater declining
  • Lake destruction: Many lakes filled or encroached; 200+ lakes lost since 1970s
  • Flooding: Bellandur and other lakes overflow during heavy rain; urban flooding
  • Air pollution: Bangalore among top 10 most polluted cities in India (2023 data)

Sand Mining:

  • Illegal river bed sand mining widespread across Karnataka’s rivers
  • Kali River (Uttara Kannada): Environmental damage from sand mining
  • National Green Tribunal intervention

Examination Strategy

KPSC KAS commonly asks:

  1. Explain the regional variations in Karnataka’s physical geography
  2. Describe Karnataka’s major river systems and their importance
  3. Analyse the Western Ghats’ significance
  4. Discuss Karnataka’s soil types and agricultural suitability
  5. Evaluate environmental challenges in Karnataka

Key distinctions:

  • Malenadu (coastal) vs maidan (interior) — rainfall and vegetation difference
  • Black cotton soil vs red sandy soil vs laterite soil (formation, distribution, use)
  • Cauvery basin vs Krishna basin (direction of flow, cropping patterns)
  • Western Ghats biodiversity vs Deccan Trap basalt (different geological foundations)

Content adapted based on your selected roadmap duration. Switch tiers using the selector above.