Kasai River

Tributary of the Congo River; part of the DR Congo-Angola border

The Kasai River (Swahili: Mto Kasai, French: Kasaï [ka.sa.i]; called Cassai in Angolan Portuguese) is a left bank tributary of the Congo River, located in Central Africa. The river begins in central Angola and flows to the 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 flows into the DRC. From Ilebo, between the confluences with Lulua river and Sankuru river, the Kasai river turns to a westerly direction. The lower stretch of the river, from the confluence with Fimi river until it joins the Congo at Kwamouth northeast of Kinshasa, is also known as the Kwa(h) River.

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