Ubangi o͞obäng´gē, yo͞obăng´– [key], Fr. Oubangui, river, c.700 mi (1,130 km) long, formed on the Congo (Kinshasa)–Central African Republic border, central Africa, by the confluence of the Uele and Bomu rivers. It flows west and south, forming part of the boundary between Congo (Kinshasa) and the Central African Republic and Congo (Kinshasa) and Congo (Brazzaville), before emptying into the Congo River, of which it is the chief northern tributary. The river is navigable to Bangui.

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