Kasai River

The third one in Top 10 Longest Rivers in Angola that Toplist would like to introduce to you is Kasai River. The Kasai River (Cassai in Angola) is a left-bank tributary of the Congo River in Central Africa. The river starts in central Angola and flows east until it reaches the border between Angola and the Democratic Republic of the Congo, where it turns north and serves as the border until it enters the DRC. The Kasai river turns west from Ilebo, between the confluences with the Lulua and Sankuru rivers. The lower stretch of the river from its confluence with the Fimi River until it joins the Congo at Kwamouth northeast of Kinshasa is known as the Kwa(h) River. The Kasai basin is primarily made up of equatorial rainforest areas that serve as agricultural land in a region known for its infertile, sandy soil. It is a tributary of the Congo River and contains diamonds. Around 60% of diamonds in Belgium are cut and shaped in the Kasai River.

On March 9, 1877, Henry Morton Stanley arrived at the confluence, calling the river Nkutu a "powerful and deep river," but recognizing it as originating from David Livingstone's Kwango.

Length: 2,153 km (1,338 mi- shared with Democratic Republic of the Congo)