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Location Mongolia, Arkhangai
Central coordinates 102o 42.00' East  47o 46.00' North
IBA criteria A1, A4i, A4iii
Area 15,200 ha
Altitude 1,332 - 1,454m
Year of IBA assessment 2009

Site description Ogii Lake is located in the valley of the Orkhon River, 350 km west of Ulaanbaatar. The site is a mesotrophic, freshwater lake with an extensive alluvial plain. The Khogshin Orkhon River enters the lake from the west. A small river, Khooloin Gol, drains the lake. There are extensive wet grasslands along the valleys of these rivers, and small pools and marshy areas along the western side of the lake. The remainder of the site comprises grassland and mountain steppe. Intensive livestock grazing takes place throughout the year. A small-scale commercial fishery operates in winter, and recreation and tourism activities are on the increase. Overgrazing, grassland degradation in dry summers, poorly managed tourism activities and steppe fires pose serious threats to the site. The IBA contains Ogii Lake Ramsar Site.

Key Biodiversity The site regularly supports significant populations of the following Globally Threatened species: Dalmatian Pelican Pelecanus crispus (VU); Swan Goose Anser cygnoides (EN); Baikal Teal Anas formosa (VU); Pallas’s Fisheagle Haliaeetus leucoryphus (VU); Lesser Kestrel Falco naumanni (VU); Siberian Crane Grus leucogeranus (CR); White-naped Crane G. vipio (VU); Hooded Crane G. monacha (VU); Great Bustard Otis tarda (VU); and Relict Gull Larus relictus (VU). The site also supports at least 1% of the flyway populations of the following congregatory waterbird species: Great Crested Grebe Podiceps cristatus; Whooper Swan Cygnus cygnus; Swan Goose Anser cygnoides; Bar-headed Goose Anser indicus; Ruddy Shelduck Tadorna ferruginea; Common Goldeneye Bucephala clangula; Common Crane Grus grus; and Northern Lapwing Vanellus vanellus.

Non-bird biodiversity: Siberian Marmot Marmota sibirica (EN), Grey Wolf Canis lupus, Corsac Fox Vulpes corsac, Red Fox V. vulpes and Pallas's Cat Felis manul (NT) occur around the lake. Fish are abundant at the site, and include the nationally threatened Taimen Hucho taimen and Mongolian Grayling Thymallus revirostris.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Swan Goose Anser cygnoid breeding  2004  present  A1, A4i  Vulnerable 
Bar-headed Goose Anser indicus 2004  present  A4i  Least Concern 
Whooper Swan Cygnus cygnus breeding  2004  present  A4i  Least Concern 
Ruddy Shelduck Tadorna ferruginea 2004  present  A4i  Least Concern 
Baikal Teal Sibirionetta formosa passage  2004  present  A1  Least Concern 
Common Goldeneye Bucephala clangula breeding  2004  present  A4i  Least Concern 
Great Crested Grebe Podiceps cristatus 2004  present  A4i  Least Concern 
Dalmatian Pelican Pelecanus crispus breeding  2004  present  A1, A4i  Vulnerable 
Lesser Kestrel Falco naumanni breeding  2004  present  A1  Least Concern 
Pallas's Fish-eagle Haliaeetus leucoryphus breeding  2004  present  A1  Vulnerable 
Great Bustard Otis tarda breeding  2004  present  A1  Vulnerable 
Siberian Crane Leucogeranus leucogeranus passage  2004  present  A1  Critically Endangered 
White-naped Crane Antigone vipio breeding  2004  present  A1  Vulnerable 
Demoiselle Crane Anthropoides virgo breeding  2004  present  A4i  Least Concern 
Common Crane Grus grus breeding  2004  present  A4i  Least Concern 
Hooded Crane Grus monacha breeding  2004  present  A1  Vulnerable 
Northern Lapwing Vanellus vanellus 2004  present  A4i  Near Threatened 
Relict Gull Larus relictus 2009  present  A1  Vulnerable 
A4iii Species group - waterbirds unknown  2004  20,000 individuals  unknown  A4iii   

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Ogii Nuur Wetlands of International Importance (Ramsar) 2,510 protected area contained by site 2,510  


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

Protection status Unprotected

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Ogii Lake. Downloaded from on 27/10/2016

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