Hoolock Gibbon is the only Ape found in India, a primate species from the gibbon family of Hylobatidae. The Hoolock Gibbons of India are second largest of the gibbons, found only at south of Brahmaputra and east of the Dibang rivers in North East Indian states.
Hoollongapar Gibbon Sanctuary in Jorhat district of Assam is an isolated protected area, surrounded by tea gardens near to Patkai mountain range. The sanctuary has a very rich biodiversity and home to only apes of India, the hoolock gibbon as well as only nocturnal primate, Bengal slow loris.
Other famous National Park and Wildlife Sanctuaries in Assam a to spot Hoolock Gibbons are Kaziranga National Park,Manas National Park,Dibru Saikhowa National Park,Borail Wildlife Sanctuary and Bornadi Wildlife Sanctuary.
Trishna Wildlife Sanctuary is a virgin forest and famous wildlife reserve of Tripura state. The sanctuary host rich variety of flora and fauna including Golden Langur, Capped Langur and Hollock Gibbon.
Ntangki National Park is one of the finest wildlife park in Nagaland and home to very rare hoolock gibbon and golden langur. The wildlife park located in Peren district of Nagaland, 35 kilometers from Dimapur.
Namdapha National Park is one of the largest national park in India and noted as richest areas in biodiversity in Northeast India.
The park along with ecoregion of Mizoram Manipur Kachin rain forest are very rich in butterflies and moths, birds,red giant flying squirrel and primates like slow loris, hoolock gibbon and capped langur.
Sonja Wildlife Rescue Centre of Meghalaya is the best place to see Hoolock Gibbon in India. The rescue centre at Chinabat village has become a tourist spot and home to large number of Western Hoolock Gibbons.