The Koshi Tappu Wildlife Reserve is a protected area in the Terai of eastern Nepal covering 175 Sq.kms. of wetlands in Sunsari, Saptari and Udayapur Districts. It comprises extensive mudflats, reed beds, and freshwater marshes in the floodplain of the Sapta Kosi River, and ranges in altitude from 75 to 81 meters. It was established in 1976 and designated as a Ramsar site in December 1987.
The reserve has recorded around 439 species of bird variety.Some of which fly all the way from Siberia during winter. A wide variety of Ducks, herons, storks egrets, ibis are seen on the Riverbank. It has one of the few elephant stables of Asia. Other animals are found here are wild buffalo wild boar, hog deer, spotted deer, bluebell and jackal. Gharial Crocodile and Gangetic dolphin are other attractions.
Wide varieties of birds find in Koshi Tappu like- Swamp Francolin, Black-necked Stork, Lesser Adjutant, Comb Duck, Falcated Duck, Spot-billed Duck, Cotton Pigmy Goose, Baer’s Pochard, Bailon’s Crake, Ruddy Crake, Greater Painted Snipe, Pheasant-tailed Jacana, Yellow-wattled Lapwing, Indian Courser, Black-bellied Tern, Imperial Eagle, White-tailed Eagle, Lesser Kestrel, Bristle Grassbird, Striated Grassbird.