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Ubangi(o͞obäng`gē, yo͞obăng`–), 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.
(also Oubangui), a river in central Africa, the largest right tributary of the Congo River (Zaïre). The Ubangi flows along the border between the Republic of Zaire and the People’s Republic of the Congo and the Central African Republic. Formed by the confluence of the Uele and Bomu rivers, it is approximately 2,300 km long (according to other data, 2,500 km), measuring from the source of the Uele, and drains an area of 772,800 sq km. It flows in a broad valley, chiefly through dense, humid tropical forests. There are numerous rapids above the city of Bangi. In its lower reaches the Ubangi reaches a width of 4 km, and at the confluence with the Congo River it forms a delta 12 km wide. The waters rise during the summer rains and reach their maximum level in October; the lowest level is in March. The mean flow rate in the lower reaches ranges from less than 2,000 to more than 15,000 cu m per sec; the mean annual flow rate is approximately 5,000 cu m per sec. The Ubangi is navigable from the mouth to the city of Bangi, a distance of 650 km; when the water level is at its maximum, the river is navigable to the confluence of its sources.