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Location India, Assam
Central coordinates 94o 22.78' East  26o 37.78' North
IBA criteria A1
Area 2,098 ha
Altitude 0
Year of IBA assessment 2004

Bombay Natural History Society

Site description Hollongapar Gibbon Sanctuary is located in Jorhat district of eastern Assam. It has a history of more than a century as a reserved forest, as it was notified on August 27, 1881 as Hollongapar Reserve Forest (Choudhury 1999). This small reserve forest is known for its primate populations and was proposed as a Sanctuary mainly for their conservation (Choudhury 1989). The Sanctuary is 25 km from Jorhat town and 320 km from Guwahati, and well connected by motorable roads. The Sanctuary covers an area of about 2,000 ha of Tropical Semi-evergreen Forest in the basin of the Brahmaputra river. The Sanctuary is known for its populations of Hoolock Gibbon Hylobates hoolock and Stump-tailed Macaque Macaca arctoides.. The first study on gibbons in this forest was carried out by Tilson (1979). Despite the fact that it is a small area, the forest is still intact. The top canopy of the forest has evergreen trees, such as Dipterocarpus macrocarpus, Shorea assamica, Artocarpus chaplasha and Tetrameles sp. The second storey also has mostly evergreens, including Mesua ferrea, Sapium baccatum and Amoora wallichii.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
White-winged Duck Asarcornis scutulata resident  2004  present  A1  Endangered 
Lesser Adjutant Leptoptilos javanicus resident  2004  present  A1  Vulnerable 
White-rumped Vulture Gyps bengalensis non-breeding  2004  present  A1  Critically Endangered 
Slender-billed Vulture Gyps tenuirostris non-breeding  2004  present  A1  Critically Endangered 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Gibbon Sanctuary 2,098 is identical to site 2,098  


IUCN habitat Habitat detail Extent (% of site)
Forest   -
Wetlands (inland)   -
Artificial - terrestrial   -

Land use

Land-use Extent (% of site)
forestry -
Notes: Forestry
nature conservation and research -
Notes: Nature Conservation
tourism/recreation -
Notes: Tourism

Acknowledgements Key contributors: Anwaruddin Choudhury and Kulojyoti Lahkar.


Choudhury, A. U. (1989) Primates of Assam: Their distribution, habitat and status. Ph. D. thesis, Gauhati University, Guwahati. 300 pp. + maps.

Choudhury, A. U. (1999) Primates in Gibbon Sanctuary Assam, India. Asian Primates 7 (1 & 2): 4-6.

Choudhury, A. U. (2000) Birds of Assam, Gibbon Books & WWF-India NE Region, Guwahati.

Tilson, R. L. (1979) Behaviour of hoolock gibbons during different seasons in Assam. J. Bombay Nat. Hist. Soc. 76: 1-16.

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Gibbon (Hollongapar) Sanctuary. Downloaded from on 21/10/2014

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