The Sunderbans National Park lies south of Kolkata, where the Ganga with its various tributaries form the largest delta of the world. Piyali, 70 kms from Calcutta via Dosarhat is the gateway to the Sunderbans. Sunderbans means the beautiful forests and derives its name from the words Sundari and ban, which means “the forests of sundari” or mangrove trees. Sunderbans is mainly covered by mangrove forests and vast saline mud flats and covers an area over 2500 square km in the Ganga-Brahmaputra delta and spread across to Bangladesh. The Sunderbans was declared as a World Heritage Site by UNESCO in 1997. The Sunderbans are the largest estuarine forests in the world. It is a land of 54 tiny islands, crisscrossed by various tributaries of Ganga, that was once infested by Arakanese and Portuguese pirates and is now, the abode of varied flora and fauna. 

This tiger and biosphere reserve still preserves the natural habitat of 200 or more Royal Bengal Tigers. Besides Tiger, Spotted deer, jungle cat, fishing cat, Indian fox, mongoose, spotted deer, wild pig, Indian flying fox, wild boar, small Indian civet, Gangetic dolphin, rhesus monkey, snake, pangolin, sea turtle, cobra, python and crocodiles are the other wildlife which can be seen here. Sunderbans is also the breeding ground of immense variety of birds like Heron, Egret, Cormorant, Fishing Eagle, White Bellied Sea Eagle, Seagul, Tern, Kingfisher, Whimprel, Black-tailed Godwit, Little Stint, Eastern Knot, Curlew, Sandpiper, Golden Plover, Pintail, White-eyed Pochard and Whistling teal. The Sunderbans are accessible only by waterways. Motor launch facilities are available round the year. The ideal time to visit the Sunderbans is during the months of August to March.

The Jaldapara Wildlife Sanctuary is situated in Alipurduar sub-division of Jalpaiguri district in West Bengal and about 124 km from Siliguri. This wildlife sanctuary is spread over an area of 114 square km. and located close to Phuntsholing in Bhutan. The nine tributaries of the Torsa river flow through the area which is shaded by tall grasses, mighty trees, perennial streams and sandy riverbanks. This sanctuary was established in the year 1941 for the protection of one-horned rhinos. The one–horned rhino, tiger, including the Royal Bengal Tiger, wild elephant, deer, bear, sambar, barking deer, hog 

deer, leopard, wild pig, bison and various other birds can also be seen here. Elephant safaris can be enjoyed at the Sanctuary. The best time to visit the sanctuary is between October and May. The nearest airport is situated at Bagdogra. Jaldapara is connected by road with Darjeeling and Siliguri. The Madarihat is the nearest railway station which is only 7 kms from the Sanctuary.