a republic in W Central Africa: formerly the French colony of Middle Congo, part of French Equatorial Africa, it became independent in 1960; consists mostly of equatorial forest, with savanna and extensive swamps; drained chiefly by the Rivers Congo and Ubangi. Official language: French. Religion: Christian majority. Currency: franc. Capital: Brazzaville. Pop: 5 260 750 (2017 est). Area: 342 000 sq km (132 018 sq miles)