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Location Mongolia, Bayan-Olgii
Central coordinates 88o 50.00' East  48o 20.00' North
IBA criteria A1, A3, A4i
Area 20,800 ha
Altitude 2,232 - 2,671m
Year of IBA assessment 2009

Site description The IBA comprises Dayan Lake, the smaller Khar Lake to the southwest, and the area surrounding these two lakes. About 10 small rivers and springs flow into the lake, and only the Khatan River flows out, later merging into the Khovd River. The lake is frozen from October to June. There is emergent vegetation along some stretches of the lake shore. The site is considered to have great potential for ecotourism but this has not yet been developed. The beautiful Mongol Altai mountains with their forests, snow-capped peaks and glaciers can be seen from the lake shore. Areas with tall grass and reeds are often heavily grazed by livestock, which also cause disturbance to breeding waterbirds. In recent years, the water level has dropped due to drought.

Key Biodiversity Three Globally Threatened species occur in significant numbers: Saker Falcon Falco cherrug (EN); Lesser Kestrel Falco naumanni (VU); and White-throated Bushchat Saxicola insignis (VU, breeding). The site also supports assemblages of species restricted to the Eurasian steppe and desert and Eurasian high montane biomes. In addition, the site supports a population of Mongolian Accentor Prunella koslowi, whose breeding range defines the Mongolian Mountains Secondary Area. The site regularly supports at least 1% of the flyway populations of Bar-headed Goose Anser indicus, Ruddy Shelduck Tadorna ferruginea and Northern Lapwing Vanellus vanellus, which occur in large numbers in autumn.

Non-bird biodiversity: Grey Wolf Canis lupus, Red Fox Vulpes vulpes and Pallas's Cat Felis manul all occur at the site.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Bar-headed Goose Anser indicus 2009  present  A4i  Least Concern 
Ruddy Shelduck Tadorna ferruginea 2004  present  A4i  Least Concern 
Lesser Kestrel Falco naumanni 2009  present  A1  Least Concern 
Saker Falcon Falco cherrug 2009  present  A1  Endangered 
Northern Lapwing Vanellus vanellus 2004  present  A4i  Near Threatened 
White-throated Bushchat Saxicola insignis breeding  2004  present  A1, A3  Vulnerable 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Altai Tavan Bogd National Conservation Park 636,161 protected area contains site 0  


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

Protection status Fully protected by Altai Tavan Bogd National Park

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Dayan Lake. Downloaded from on 26/10/2016

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