The Koshi Tappu Wildlife Reserve is a protected area in the Terai of eastern Nepal covering 175 km (68 sq mi) of wetlands in the 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 m (246 to 266 ft). It was established in 1976 and designated as a Ramsar site in December 1987.[1]