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Location India
Central coordinates 78o 0.00' East  33o 18.00' North
IBA criteria A1
Area 10,000 ha
Altitude 0
Year of IBA assessment 2004

Bombay Natural History Society



Site description Tso Kar Basin is the basin of a former large freshwater lake (Chatterjee et al. 2002). It lies between the Zanskar range in the southwest and the Ladakh range in the northeast, south of the Indus river. It is called Tsokar, meaning white lake, because of the white salt efflorescence found on the margins due to the evaporation of highly saline water. The waterspread has contracted into two principal waterbodies, Startsapuk Tso, a freshwater lake of about 300 ha to the south, and Tso Kar itself, a hypersaline lake of 2,200 ha to the north. The lakes are frozen over from November to April. Startsapuk-Tso is fed by perennial springs and snow, and attains a maximum depth of 3 m in July and August, when it overflows northwards into Tso Kar. The basin is surrounded by peaks rising to over 6,000 m. The presence of freshwater mollusc Lymnea auricularia fossils proves that it was a freshwater lake in the past (Sharma 2000). The present lake is a remnant of a large freshwater lake of nearly 13,600 ha. In the less saline parts of the basin, the pools have aquatic vegetation including Potamogeton and Hydrilla spp. These plants die in winter, and form floating mats of vegetation in spring. The adjacent freshwater marshes and damp meadows support a mixture of Carex and Ranunculus spp. The arid steppe vegetation of the surrounding areas is dominated by species of Astragalus and Caragana.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Black-necked Crane Grus nigricollis 2004  present [units unknown]  A1  Vulnerable 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Tso Kar Sanctuary 0 protected area contained by site 0  

Habitats

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

Land use

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

Acknowledgements Key contributors: Otto Pfister and Rauf Zargar.

References 

Chatterjee, A., Chandan, P., Gautam, P. and Droz, B. H. (2002) High Altitude Wetlands of Ladakh: A Conservation Initiative. WWF-India, New Delhi. Pp. 38.

Pfister, O. (1998) Breeding ecology and conservation of the Black-necked Crane (Grus nigricollis) in Ladakh/India. University of Hull, Hull, UK.

Pfister, O. (2000) Biodiversity of the High Altitude Wetlands and their Importance for Migratory Waterfowl, Paper presented at the National Consultation Workshop: Conservation of High Altitude Wetlands. WWF-India, Leh.

Sharma, V. P. (2000) Geology of the Ladakh Region, J & K State with special reference to High Altitude Lakes. Paper presented at National Consultation Workshop: Conservation of High Altitude Wetlands. WWF-India, Leh.

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Tso Kar Basin. Downloaded from http://www.birdlife.org on 23/04/2014

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