Kalash Island, in South 24 Parganas, is a part of Sundarbans National Park that lies at the estuary of the River Matla. Being outside the Core area of Sundarbans, visitors with armed guards are permitted to get down on the beach.
During winters, it is the breeding ground of the Olive Ridley Turtles that arrive in great numbers on this beach for nesting.
Kalash Island is also the home to many varieties of coastal birds and is specially a good place to spot uncommon waders. The Great Stone-curlew or Great Thick-knee (Esacus recurvirostris) is sighted on the beach.
Access by boat to this beautiful beach is usually from the Forest Department's Kalash Camp. A visit to Kalash Island combines the Sundarbans experience with bird-watching. There is no staying option at this camp, however, an excursion can be done in a 3Night or 4 Night Trip. .