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Location Mongolia, Zavkhan
Central coordinates 96o 36.00' East  49o 7.00' North
IBA criteria A1, A4i
Area 20,189 ha
Altitude 1,664 m
Year of IBA assessment 2009

Site description This is a beautiful steppe lake located in a valley between Bulnai and Khan Khokhii mountains. The site comprises Oigon Lake and two nearby lakes: Shorbog Nuur; and Nogoon Nuur. Several small rivers enter the lake from the north, creating a marshy and wet grassland delta. Some streams have stopped running because of drought, however.

Key Biodiversity The Globally Threatened Saker Falcon Falco cherrug (EN) occurs at the site. The site regularly supports at least 1% of the flyway population of Ruddy Shelduck Tadorna ferruginea, while Common Goldeneye Bucephala clangula and Herring Gull Larus argentatus occur in numbers that almost meet the 1% threshold.

Non-bird biodiversity: Grey Wolf Canis lupus, Red Fox Vulpes vulpes, Pallas’s Cat Felis manul (NT) and Siberian Marmot Marmota sibirica (EN) occur at the site.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Ruddy Shelduck Tadorna ferruginea 2009  present  A4i  Least Concern 
Common Goldeneye Bucephala clangula 2009  present  A4i  Least Concern 
Saker Falcon Falco cherrug 2009  present  A1  Endangered 
Larus argentatus 2009  present  A4i  Not Recognised 

Protection status Unprotected

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

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