Your vote on this answer has already been received
Sundarban is the largest delta in India. The Sundarbans are a part of the world's largest delta formed by the rivers Ganges, Brahmaputra and Meghna. They are vast tract of forest and saltwater swamp forming the lower part of the Ganges Delta, extending about 260 km along the Bay of Bengal from the Hooghly River Estuary in India to the Meghna River Estuary in Bangladesh. Sunderban covers an area of 4262 sq. km in India.