Kauylzhyr

The Kauylzhyr (Қауылжыр; Каульжур) is a river in Shalkar District, Aktobe Region, Kazakhstan. It is 142 km long and has a catchment area of 1810 km2.

The river is part of the Shalkar Basin. It is fed mainly by snow. Its waters are used to water livestock.

Course
The Kauylzhyr has its sources on the southeastern slopes of the Mugalzhar Hills. It heads roughly southeastwards most of its course. In its final stretch it bends southwards and enters lake Shalkar from the north.

The width of the river channel is between 50 m and 150 m. The main tributaries of the Kauylzhyr are the Alabassay, Karabulaksay, Sarysay and Koganzhar.