A shallow fresh-water lake in bunch-grass steppe, in Korgalgin Natural Reserve ("Kurgal'dginskyi Zapovednik"). The lake is a part of the lake system of the Nura river basin. The landscape is typical for Central Kazakhstan dry steppe.
In the Natural Reserve, 327 bird species have been recorded (including 126 breeding species). 46 species are included in the Red Data Books of Kazakhstan and IUCN. Within the IBA, several tens of water-bird and passerine species breed (including Dalmatian Pelican, White-headed Duck, Black-winged Pratincole etc), and many species migrate and stop here in great number in spring and autumn, as well as for moulting (swans, ducks, gees etc.).
Non-bird biodiversity: In the Nature Reserve, there are 41 species of mammals, 4 reptiles, 2 amphibians, 14 fishes, about 400 plants.
BirdLife International (2021) Important Bird Areas factsheet: Isei Lake. Downloaded from http://www.birdlife.org on 27/01/2021.