Buxa Tiger Reserve in Eastern Dooars area is the largest stretch of forest in Dooars.Adorning the northeastern corner of West Bengal, bordering Bhutan and Assam, Buxa Tiger Reserve was set up at on 16th February 1983 and was then, the 15th tiger reserve of the country. The forest constituting the Buxa Tiger Reserve is the largest in the Dooars - the Alluvial floodplains of Northeast India. Spanning over a whopping 759 sq. km., this tiger reserve is irrigated by several rivers and their tributaries. It boasts of a diverse and breathtaking landscape. In fact, because of the rocky terrain, many parts of the forest in the Buxa hills that lie in the Sinchula Range are inaccessible even by the authorities, and hence remain unexplored even after so many years! Another interesting fact about this tiger reserve is that it serves as an international corridor for the migration of elephants between India and Bhutan! This is because the Phipsu Wildlife Sanctuary in Bhutan is adjacent to the northern part of the Buxa Tiger Reserve. This reserve is home to 67 species of mammals, 36 species of reptiles and 230 species of unidentified avifauna and encompasses more than eight types of forests. The great diversity of mammals in this reserve makes it the second highest among all tiger reserves in India.