Hollongapar Gibbon Wildlife sanctuary, more popularly known as Gibbon Wildlife Sanctuary named after Hoolock Gibbon covers an area of 20.98 square kilometers (including the area under Military Engineering Services of Indian Army) at Jorhat district of Assam. The Hoollongapar Gibbon Wildlife Sanctuary was earlier known as Hoollongapar Forest during British period in 1881. This sanctuary is approximately 19 km from Jorhat's town centre and 5 km from Mariani.