There are about 80 large rivers in Africa. Sixty-three of them are international (transboundary) river basins covering about 64% of its land area and contain 93% of its total surface water resources.
The map below shows 13 major river basins in Africa: Congo, Niger, Nile, the Senegal, Juba Shibeli, Lake Chad, Lake Turkana, Limpopo, Ogooue, Okavango, Orange, Volta, and Zambezi river.
The Major River Basins of Africa
Reddit user symmy546 created a map of all of the rivers and waterways in Africa, colored according to the significant hydrological basins.
He created this map using hydrological data and python libraries: matplotlib, numpy and geopandas.
Below is another version of the map of the river basins of Africa, made using a digital elevation model by Sheikh Rokon.