It is formed by the confluence of many smaller streams and rivers that rise in the south of the territory, of which the Lokwa and Labua are the most important, taking the name of Kamtsha after their union to the west of Idiofa.

At this point the river is just 20 metres (66 ft) wide, but it grows to 100 metres (330 ft) in its lower reaches, entering the Kasai at Eolo.

The Luana, which runs almost parallel to the Kamtsha, is 20 metres (66 ft) near its mouth.

After the Luana has joined it, the river has no more rapids and is navigable down to the Kasai.

This article related to a river in the Democratic Republic of the Congo is a stub.