Kerala Geography: Physical Features, Climate, and Natural Resources

Kerala’s physical geography is one of the most frequently asked topics in Kerala PSC exams. Questions cover the Western Ghats, passes, hill stations, physiographic divisions, soil types, and climate patterns. Expect 3-5 questions per paper.

Basic Geographic Facts

Fact	Details
Location	South-western tip of India; between 8 deg 18’ N and 12 deg 48’ N latitude; 74 deg 52’ E and 77 deg 22’ E longitude
Area	38,863 sq km (1.18% of India’s area)
Rank by area	21st among Indian states
Length	580 km (north to south)
Maximum width	120 km
Minimum width	35 km (at Wayanad)
Coastline	590 km
Borders	Karnataka (north), Tamil Nadu (east and south), Lakshadweep Sea/Arabian Sea (west)
Districts	14
Highest point	Anamudi (2,695 m) — highest peak in South India (in Idukki district)

Three Physiographic Divisions

Division	Elevation	Characteristics	Area Share
Highlands (Mala Nadu)	Above 75 m (hills above 750 m)	Western Ghats, tea/coffee/spice plantations, forests	About 48%
Midlands (Idanadu)	7.5 m to 75 m	Undulating terrain, rubber/cashew/tapioca, laterite soil	About 42%
Lowlands (Theeranadu)	Below 7.5 m	Coastal plain, backwaters, coconut/rice, alluvial and sandy soil	About 10%

Western Ghats in Kerala

Fact	Details
Also called	Sahyadri Mountains
UNESCO status	Western Ghats inscribed as World Heritage Site (2012) — 39 serial sites, several in Kerala
Runs along	Entire eastern border of Kerala
Key ranges in Kerala	Brahmagiri (Wayanad), Nilgiri (touching Kerala-TN-Karnataka), Anaimalai, Palani Hills, Cardamom Hills
Biodiversity	One of world’s 8 “hottest hotspots” of biodiversity
Gadgil Committee	2011 — recommended zoning of Western Ghats (Ecologically Sensitive Zones)
Kasturirangan Committee	2013 — modified Gadgil recommendations; identified 37% of Western Ghats as ESA

Major Peaks in Kerala

Peak	Height	Location (District)
Anamudi	2,695 m	Idukki (Eravikulam NP)
Meesapulimala	2,640 m	Idukki
Makuthimala (Mukurti)	2,554 m	Near Nilgiris border
Banasura Peak	2,073 m	Wayanad
Agasthyamala	1,868 m	Thiruvananthapuram-Kollam border
Ponmudi	1,100 m	Thiruvananthapuram

Mountain Passes (Gaps) in Western Ghats — Kerala

Pass	Connects	District	Significance
Palakkad Gap (Palghat Gap)	Kerala and Tamil Nadu	Palakkad	Largest break in Western Ghats (32 km wide); only significant pass; NH-544 passes through; influences climate (dry belt in Palakkad)
Perambadi Pass	Wayanad to Mysore (Karnataka)	Wayanad	Connects to Mysore plateau
Thamarassery Pass (Wayanad Ghat)	Kozhikode to Wayanad	Kozhikode-Wayanad	9 hairpin bends (Thamarassery Churam)
Bodinayakanur Pass	Idukki to Theni (TN)	Idukki	Connects Munnar area to Tamil Nadu
Shenkottai Pass	Kollam to Tenkasi (TN)	Kollam	Southern route to Tamil Nadu
Kambam Pass	Idukki to Kambam Valley (TN)	Idukki	Route to Theni district

Palakkad Gap — Key Facts

Fact	Details
Width	About 32 km
Elevation	About 140 m above sea level
Significance	Only major break in 1,600 km Western Ghats; allows monsoon winds to pass through; makes Palakkad drier; trade route since ancient times
Climate effect	Rain shadow area east of gap; Palakkad has relatively lower rainfall
Historical	Invasion route for Mysore (Tipu Sultan, Hyder Ali attacked Kerala through this gap)

Hill Stations in Kerala

Hill Station	District	Elevation	Known For
Munnar	Idukki	1,600 m	Tea plantations; Eravikulam NP; Neelakurinji (blooms every 12 years)
Wayanad	Wayanad	700-2,100 m	Spice gardens; tribal settlements; Edakkal Caves
Ponmudi	Thiruvananthapuram	1,100 m	Golden Peak; viewpoints
Vagamon	Idukki-Kottayam	1,100 m	Pine forests; meadows
Nelliyampathy	Palakkad	467-1,572 m	Orange plantations; tea estates
Ranipuram	Kasaragod	750 m	Shola forests; trekking
Devikulam	Idukki	1,800 m	Lake; tea estates; near Munnar
Peermede	Idukki	915 m	Rubber/tea/coffee/cardamom plantations
Lakkidi	Wayanad	700 m	Gateway to Wayanad; highest rainfall area in Kerala
Agasthyakoodam	Thiruvananthapuram	1,868 m	Pilgrimage; rare herbs; tribal area

Soil Types in Kerala

Soil Type	Location	Characteristics	Crops
Laterite	Midlands and hilly areas (most widespread)	Red/reddish-brown; rich in iron and aluminium; acidic; poor in nutrients	Cashew, rubber, coconut, arecanut
Alluvial	River banks and coastal areas	Fertile; deposited by rivers; rich in minerals	Rice, sugarcane, vegetables
Red Soil	Parts of Kasaragod, Kannur	Rich in iron oxide; poor in nitrogen and humus	Coconut, cashew
Sandy/Coastal	Narrow coastal belt	Sandy; poor water retention; saline near coast	Coconut, cashew
Forest/Humus	Western Ghats (high altitude)	Rich in organic matter; dark; acidic	Tea, coffee, cardamom
Black Soil (limited)	Small pockets in Palakkad	Rich in clay; retains moisture	Rice
Peaty/Marshy	Kuttanad and coastal waterlogged areas	Acidic; waterlogged; organic-rich	Rice (below sea level cultivation in Kuttanad)

Climate of Kerala

Fact	Details
Type	Tropical monsoon climate (Koppen: Am)
Seasons	Summer (March-May), South-West Monsoon (June-September), North-East Monsoon (October-November), Winter (December-February)
Average rainfall	About 3,000 mm per year
Hottest months	March-April
Average temperature	25-32 deg C (coastal); 15-20 deg C (highlands)
Highest rainfall area	Lakkidi (Wayanad) / Neriamangalam
Lowest rainfall area	Chinnar (Idukki) — rain shadow region
Monsoon onset	South-West monsoon hits Kerala coast first in India (typically 1 June)

Monsoon in Kerala

Monsoon	Period	Contribution	Details
South-West Monsoon (Edavappathy)	June-September	About 65-70% of rainfall	From Arabian Sea; strikes Kerala first; called “Edavappathy” because it arrives in Malayalam month Edavam
North-East Monsoon (Thulavarsham)	October-November	About 15-20% of rainfall	Called “Thulavarsham” (rain of Thulam month); more effective in southern Kerala
Pre-monsoon showers	March-May	About 10-15%	Mango showers; thunderstorms

Natural Disasters in Kerala

Disaster	Details
Floods 2018	Worst in nearly a century; all 14 districts affected; 483 deaths; compared to Great Flood of 1924 (99-year flood)
Floods 2019	Severe flooding again; landslides in Wayanad, Malappuram
Cyclone Ockhi (2017)	Struck southern Kerala coast; 245 fishermen died/missing
Landslides	Common in Western Ghats during monsoon (Kavalappara 2019, Puthumala 2019, Wayanad 2024)
1924 Great Flood	Worst recorded flood in Kerala history (also called “99 flood” in Malayalam calendar)
Coastal erosion	Major issue; 63% of Kerala coastline faces erosion
Earthquake zone	Kerala falls in Seismic Zone III (moderate risk)

Quick Recall — PSC Favourites

Question	Answer
Highest peak in Kerala/South India?	Anamudi (2,695 m)
Anamudi is in which district?	Idukki
Largest pass in Western Ghats?	Palakkad Gap
Width of Palakkad Gap?	About 32 km
Area of Kerala?	38,863 sq km
Coastline of Kerala?	590 km
Number of districts?	14
Most widespread soil in Kerala?	Laterite
Average annual rainfall?	About 3,000 mm
Monsoon hits India first at?	Kerala coast (around 1 June)
Edavappathy refers to?	South-West Monsoon
Thulavarsham refers to?	North-East Monsoon
Lowest rainfall area in Kerala?	Chinnar (rain shadow)
Neelakurinji blooms every?	12 years (next: 2030)
Great Flood of Kerala?	1924
2018 floods compared to?	1924 floods
Western Ghats UNESCO year?	2012
Kerala borders how many states?	2 (Karnataka, Tamil Nadu)
Banasura Peak in?	Wayanad
Agasthyamala in?	Thiruvananthapuram-Kollam border