In 1992, the Government of West Bengal declared its intentions to constitute a national park over 117.10 km2 (45.21 sq mi) of the Buxa Wildlife Sanctuary.

The Sinchula hill range lies all along the northern side of Buxa Tiger Reserve, and the eastern boundary touches that of the Assam state.

It is the easternmost extension of extreme bio-diverse North-East India and represents highly endemic Indo-Malayan region.

[3] Forest types include:[citation needed] During a survey in May 2000 to July 2001, 284 bird species were recorded including Eurasian griffon (Gyps fulvus), Amur falcon (Falco amurensis), Malayan night heron (Gorsachius melanolophus), Oriental pied hornbill (Anthracoceros albirostris), rufous-necked hornbill (Aceros nipalensis), chestnut-breasted partridge (Arborophila mandellii), cinnamon bittern (Ixobrychus cinnamomeus), stripe-breasted woodpecker (Dendrocopos atratus), velvet-fronted nuthatch (Sitta frontalis) and black-naped oriole (Oriolus chinensis).

[1] The Narathali lake, Raidāk and Jayanti rivers provide habitat to migratory birds like common merganser (Mergus merganser), Eurasian teal (Anas crecca), black-necked crane (Grus nigricollis), black stork (Ciconia nigra), and ferruginous pochard (Aythya nyroca).

[8] Endangered species present in the reserve are leopard cat, Bengal florican, reticulated python, Chinese pangolin, hispid hare,[9] hog deer[2][3] lesser adjutant (Leptoptilos javanicus), white-rumped vulture (Gyps bengalensis), slender-billed vulture (Gyps tenuirostris), chestnut-breasted partridge (Arborophila mandellii), rufous necked hornbill (Aceros nipalensis), ferruginous pochard (Aythya nyroca) and great hornbill (Buceros bicornis).