It is a shallow brackish water lake covering 860 ha (2,100 acres) area.

While the ducks generally brooding at the Little Lake in the south, the gulls and common terns prefer the islets in colonies.

Before and after breeding periods, a great number of waders are observed, including black-necked grebe, ruddy shelduck, white-headed duck, black-winged stilt, avocet and snowy plover.

Lake Düden is an important breeding habitat in Turkey for the world-wide endangered species white-headed duck.

The excessive consumption of groundwater and surface water in the Konya Closed Basin started to affect the lake.

As a result of the sinking of water level, the islets were connected with each other, and the breeding of birds stopped.