Koksu (Karatal)

The Koksu (Көксу, Köksu; 'meaning "blue water") is a river of the Balkhash-Alakol Basin, Kazakhstan. It flows within Almaty Region, in the historical Semirechye region, from the western slopes of the Dzungarian Alatau. The river is 205 km long and has a basin area of 4670 km2.

It is the largest river in the Koksu District, named after it.

Several hydro-electric projects are located along the river including the Kyzylbulak Hydroelectric Power Plant and Kyzylkungei Hydroelectric Power Plant.