Kauylzhyr

The Kauylzhyr is a river in Shalkar District, Aktobe Region, Kazakhstan. It is long and has a catchment area of.
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 and. The main tributaries of the Kauylzhyr are the Alabassay, Karabulaksay, Sarysay and Koganzhar.