Sunderban is the largest delta and mangrove forest in the world. The Indian Sunderban is bound on the west by river Muriganga and on the east by rivers Harinbhahga and Raimangal. Other major rivers flowing through this eco-system are Saptamukhi, Thakuran, Matla and Goasaba.
Sunderban has extremely rich diversity of aquatic and terrestrial flora and fauna. In fact, Sunderban’s highly productive ecosystem acts as a natural fish nursery.
Although the region is situated south of the Tropic of Cancer, the temperature is equable due to its proximity to the sea. Average annual maximum temperature is around 35oC . Average annual rainfall is 1920 mm.
The Biogeography of Sunderban is unique and the region harbours a rich diversity in terms of species content, ecosystem and habitat types.
This deltic ecosystem, which is the single largest continuous area in the world for threatened Bengal Tiger and largest contiguous mangrove-patch on globe (along with Bangladesh), is very productive and well known for its greater degree or specialization. Sunderban is the larges mangal diversity of the planet (81 plant and 1586 animal species.)