A deep freshwater lake supporting extensive reedbeds and a rich floating and submerged vegetation. The lake is fed by springs and run-off, and at times of high water level drains into the Caspian Sea. The water is very clear and it is one of the few freshwater wetlands located near the Caspian Sea. The area is important for several species of wintering waterbirds, mostly Anatidae (ducks, geese, swans, etc.), including endangered white-headed duck (Oxyura leucocephala).