1A major river of central Africa, which rises as the River Lualaba to the south of Kisangani in northern Democratic Republic of Congo (Zaire) and flows 4,630 km (2,880 miles) in a great curve westwards, turning south-westwards to form the border with the Congo before emptying into the Atlantic.
2An equatorial country in Africa, with a short Atlantic coastline; population 6,800,000 (estimated 2015); languages, French (official), Kikongo, and other Bantu languages; capital, Brazzaville. Also called Republic of Congo, Congo-Brazzaville.
The region was colonized in the 19th century by France, and as Middle Congo formed part of the larger territory of French Congo (later, French Equatorial Africa). The country became independent in 1960