Geography

Sundarbans

Also: Sundarban, Sundarbans mangroves, Sundarban delta

Definition
The largest contiguous mangrove forest in the world, spread across the seaward edge of the Ganga–Brahmaputra–Meghna delta in West Bengal (India) and Bangladesh, known for its tidal creeks, the Royal Bengal tiger living in a saltwater habitat and its role as a natural shield against cyclones.
Summary card: Sundarbans. Shared by India (about 40%) and Bangladesh (about 60%). Indian part: Sundarban National Park and Tiger Reserve. UNESCO World Heritage Site (Indian part 1987). Ramsar site in India (2019); named after the sundari tree
Summary card © UPSCPrep.in

Background and evolution

The Sundarbans grew on land built by three great rivers. Over thousands of years the Ganga, Brahmaputra and Meghna carried enormous loads of silt from the Himalaya and laid it down where they meet the Bay of Bengal. Twice a day the tide floods these low islands, and only plants adapted to salt water and waterlogged mud can survive. The result is a maze of islands, mudflats and channels covered with mangroves, stretching from the Hooghly estuary in India to the Baleswar river in Bangladesh.

The forest takes its name, by most accounts, from the sundari tree (Heritiera fomes), a valuable mangrove species. People have lived on the edges of the forest for centuries, clearing islands for paddy behind earthen embankments and entering the forest to fish, collect honey and cut wood. In the Indian part, a large share of the islands was reclaimed during the colonial period, and the remaining forest was later protected under Project Tiger in 1973 and as a national park in 1984. The area's culture includes worship of Bonbibi, the forest goddess believed to protect people from tigers.

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Last reviewed: 23 October 2026 · Original UPSCPrep.in content.