The Nile river.
niger river
The Nile River
The principal African rivers are the Nile; Niger; Congo & Zambeisei.
africa
The Nile River.
it is a major tributary of the Congo River in Central Africa
the Nile River, Niger River, Congo River, Zambezi River
Niger river
It depends on your definition of "major," but the Zambezi is the fourth-longest river in Africa.
The Orange River.
Niger river