Kusu Mangbetu
Between the Lomami and the Lualaba, Kusu Mangbetu lies in the forested interior of the Congo basin. The Lomami runs north towards the Congo, passing through a transition from wooded country to humid forest. Communities on either side of its middle course include the Tetela and Kusu, whose languages and histories are closely related. The two great rivers frame a country traversed by their tributaries, far from the Atlantic mouth of the Congo.