Valmiki Tiger Reserve forms the eastern most limit of the Himalayan Terai forests in India, and is the only tiger reserve of Bihar. Situated in the Gangetic Plains bio-geographic zone of the country, the forest has combination of bhabar and terai tracts. Valmiki Tiger Reserve lies in the north-westernmost West Champaran district of Bihar. Name of the district has been derived from two words Champa and Aranya meaning Forest of Champa trees. Wild mammals found in the forests of Valmiki Tiger Reserve are Tiger, Sloth bear, Leopard, Wild dog, Bison, Wild boar etc.