Lake Balkhash
The river flows north from the border with China before turning north-westward passing by Matay and then northward when it reaches the Saryesik-Atyrau Desert, a large sand desert south of Lake Balkhash. The river empties into Lake Balkhash just west of the Lepsy River on its southern side. Aksu freezes in December and stays icebound until March. Because of irrigation, the river's flow into Lake Balkash is limited.