Kerala Geography for UPSC: Interactive Map, Rivers and Protected Areas

Periyar

Rises Sivagiri hills of the Western Ghats, Idukki district; flows to Arabian Sea near Kochi · 322 km

The longest river of Kerala (about 244 km), rising in the Sivagiri hills and emptying into the Arabian Sea near Kodungallur. It feeds the Idukki arch dam (one of Asia's highest) and the Mullaperiyar dam, the 1886 colonial-era dam at the centre of the Kerala–Tamil Nadu water dispute, a recurring UPSC current-affairs hook.

Bharathapuzha

Rises Anamalai hills (Western Ghats), near the Tamil Nadu border; flows to Arabian Sea at Ponnani · 137 km

The Nila, Kerala's second-longest river, flows from the Anamalai hills through the Palakkad Gap to the sea at Ponnani. UPSC links it with the Palakkad Gap (the Western Ghats' most important break, carrying the monsoon and the transport corridor) and with the Malampuzha dam.

Pamba

Rises Peerumedu plateau, Western Ghats, Idukki district; flows to Vembanad Lake · 247 km

Rising near Peerumedu and draining into the Vembanad backwaters, the Pamba is best known for Sabarimala on its banks. The Pamba Action Plan for river restoration is a standard environment-governance reference.

Chaliyar

Rises Ilambeleri hills near Wayanad, Western Ghats; flows to Arabian Sea at Beypore, Kozhikode · 104 km

Originating in the Nilgiri-Wayanad hills and meeting the sea at Beypore, the Chaliyar hosts the historic Beypore port, useful as a map-location and trade-geography anchor.

Chalakudy

Rises Anamalai hills, Western Ghats; flows to joins the Periyar near the coast · 44 km

Rising in the Anamalai hills, the Chalakudy plunges over Athirappilly (Kerala's largest waterfall) before joining the Periyar. Athirappilly is a standard hydro-tourism and river-diversion-environment question hook.

Achankovil

Rises Rishimala hills of the Western Ghats; flows to joins the Pamba near Veeyapuram · 158 km

A shorter west-flowing river of southern Kerala that joins the Pamba near Veeyapuram before the Vembanad system, tested mainly as part of Kerala's west-flowing river geography.

Kabani

Rises Wayanad plateau, Western Ghats; flows to joins the Kaveri in Karnataka · 21 km

The Kabini, rising in Wayanad, is Kerala's one major east-flowing river, a tributary of the Cauvery. UPSC uses it to contrast Kerala's short west-flowing rivers with the east-flowing Cauvery system.

Bhavani

Rises Nilgiri hills (western slopes), near the Kerala, Tamil Nadu border; flows to joins the Cauvery at Bhavani, Tamil Nadu · 52 km

A Cauvery tributary rising in the Nilgiri foothills near Silent Valley; its headwaters relate to Kerala's protected-area geography (Silent Valley) more than to the river itself.

Valapattanam

Rises Brahmagiri hills of Karnataka (Western Ghats); flows to Arabian Sea at Azhikkal, Kannur · 62 km

The principal river of Kannur district, rising in the Brahmagiri hills of Karnataka, a small-state, trans-boundary river example.

Kallada

Rises Kulathupuzha hills near the Shencottah gap; flows to Ashtamudi Lake at Kollam · 135 km

Draining into Ashtamudi lake, the Kallada is the site of the Thenmala dam (Kallada Irrigation Project), the standard dam-and-lake pairing for south Kerala.

Vembanad-Kol Wetland

Kerala's largest lake and India's longest lake system, designated Ramsar in 2002, lying below sea level along the Arabian Sea coast. It hosts the Nehru Trophy boat race and supports lakhs of livelihoods in backwater fisheries and tourism.

Ramsar (2002); Kerala's largest backwater lake system.

Ashtamudi Wetland

A palm-shaped estuary lake in Kollam district designated Ramsar in 2002, the gateway to Kerala's backwaters, with extensive mangroves and clam fisheries.

Ramsar (2002); Kollam's palm-shaped backwater estuary.

Sasthamkotta Lake

Kerala's largest freshwater lake, in Kollam district, designated Ramsar in 2002. A rain-fed lake with no major inlet, it supplies drinking water to the Kollam region.

Ramsar (2002); Kerala's largest freshwater lake.

Agasthyamalai Biosphere

A biosphere reserve in the southern Western Ghats around the Agasthyamalai peak, spanning Kerala and Tamil Nadu, rich in endemic plants and home to the lion-tailed macaque, Nilgiri langur and the Kanikaran tribe's medicinal plant traditions.

The southernmost biosphere reserve of the Western Ghats, spanning Kerala and Tamil Nadu around the Agasthyamalai peak, tied to the Kanikaran tribe and lion-tailed macaque conservation.

Nilgiri Biosphere

The Kerala portion of India's first biosphere reserve, covering Wayanad and Silent Valley, contiguous with Bandipur-Nagarhole-Mudumalai, a tiger and elephant landscape and UNESCO biodiversity hotspot.

India's first biosphere reserve (1986), shared by Kerala, Tamil Nadu and Karnataka, the founding reference for the Biosphere Reserve concept in India.

Periyar National Park

A park in Idukki district around the Periyar lake formed by the Mullaperiyar dam, part of a Project Tiger/Project Elephant reserve. Known for boat-based wildlife viewing of elephants, sambar and the Nilgiri langur.

A tiger reserve and elephant reserve centred on the Periyar lake inside the Cardamom Hills, a flagship Western Ghats protected area whose name comes from the river, not the park.

Silent Valley National Park

A park in Palakkad district protecting one of the last substantial stretches of tropical evergreen rainforest in the Western Ghats. Saved from a hydroelectric project by the famous Silent Valley movement of the 1970s-80s; home to the lion-tailed macaque.

The evergreen forest on the Kunthipuzha (a Bharathapuzha tributary) that defeated the Silent Valley Hydroelectric Project in the 1980s, India's canonical environment-versus-development case study.

Eravikulam National Park

A park in Idukki district on the high Anamalai plateau (Anamudi, 2,695 m, is the highest peak south of the Himalaya). Home to the largest population of the Nilgiri tahr, and famous for the Neelakurinji mass flowering every 12 years.

The Anamudi massif's park, protecting the Nilgiri tahr (the state animal of Tamil Nadu), the highest elevation national park south of the Himalaya.

Anamudi Shola National Park

A park in Idukki district protecting shola forests and grasslands around Anamudi, designated to safeguard the catchment and the Nilgiri tahr habitat of the Munnar landscape.

Shola-grassland park around Anamudi in the Munnar hills.

Wayanad Wildlife Sanctuary

A sanctuary in Wayanad district, part of the Nilgiri Biosphere Reserve and the Wayanad Elephant Reserve, contiguous with Nagarhole and Bandipur. Known for elephants, tigers and vultures.

Part of the Nilgiri Biosphere Reserve; contiguous with Nagarhole-Bandipur.

Chinnar Wildlife Sanctuary

A sanctuary in Idukki district on the rain-shadow eastern slopes of the Western Ghats, known for the grizzled giant squirrel and the star tortoise.

Rain-shadow eastern Ghats slopes; grizzled giant squirrel habitat.

Thattekad Bird Sanctuary

A lowland bird sanctuary in Ernakulam district between the Periyar river branches, made famous by Dr Salim Ali who called it the richest bird habitat in peninsular India. Known for the Ceylon frogmouth.

Salim Ali's 'richest bird habitat in peninsular India'; Ceylon frogmouth.

Parambikulam Wildlife Sanctuary

A sanctuary in Palakkad district, part of the Anamalai Tiger Reserve, with teak plantations (including the world's largest planted teak, Kannimara) and rich wildlife.

Part of Anamalai Tiger Reserve; Kannimara, the world's largest planted teak.