The site comprises a freshwater lake in the southwest of Santmargats soum. Only the Mukhar Khunguin River enters the lake, and there is no outflow. The Mukhar Khunguin River delta is a rich wetland. The lake is frozen from November to May. The lake is surrounded by mountains, and the Bor Khar sand dunes lie to the south. The primary land use is livestock grazing. The lake has good recreational potential.
Three Globally Threatened species are found at the site: Dalmatian Pelican Pelecanus crispus (VU); Pallas's Fisheagle Haliaeetus leucoryphus (VU); and Saker Falcon Falco cherrug (VU). The site regularly supports at least 1% of the flyway populations of Great Crested Grebe Podiceps cristatus and Dalmatian Pelican.
Non-bird biodiversity: No information is available on other fauna and flora.
BirdLife International (2017) Important Bird Areas factsheet: Santmargatsyn Bayan Lake. Downloaded from http://www.birdlife.org on 21/11/2017.