 | | The prefectures are named for the major rivers of the area: Ubangui, Nana, Mambéré, Kadeï, Lobaye, M'Poko, Ombella, Sangha, Kémo, Ouaka, Kotto, and M'Bomou all flow into the Congo; Pendé, Ouham, Gribingui, Bamingui, Bangoran, and Vakaga all flow into the Chari, and thus to Lake Chad. |