Congo is a geographic and political name used for several related places in Central Africa: two neighbouring countries, a major river, and historical states. Because the term appears in multiple contexts, it is important to distinguish between the modern countries, the great waterway that divides them, and earlier colonial-era entities.
Modern countries
The two present-day countries commonly called "the Congos" are the Democratic Republic of the Congo and the Republic of the Congo. The Democratic Republic of the Congo (capital: Kinshasa) occupies a vast territory across the central basin and was administered by Belgium as the Belgian Congo until independence in 1960. After a period of political change it was known for a time as Zaire under Mobutu Sese Seko. The smaller Republic of the Congo (capital: Brazzaville), directly across the river, was part of French colonial territories and also became independent in 1960.
The Congo River and basin
The Congo River is the continent’s second-largest river by discharge and a central feature of the Congo Basin, a vast watershed dominated by tropical rainforest. The river and its tributaries are vital for transport, local livelihoods, fisheries and regional ecology. The Congo Basin is one of the world’s largest contiguous rainforests, important for biodiversity and carbon storage.
Historical polities
Several historical entities have used the name Congo. Most notable is the Congo Free State, a late 19th-century polity that was established under the control of King Leopold II of Belgium and later became the Belgian Congo. Colonial rule, missionary activity and the slave trade all shaped the region’s modern borders, societies and languages.
Because the two capitals, Kinshasa and Brazzaville, face one another on opposite banks of the river, the term "Congo" often requires context to indicate which country or feature is meant. The region remains geopolitically and ecologically significant: it hosts diverse peoples and languages, large mineral reserves and substantial tropical forest cover, and it continues to attract attention for conservation, development and historical study.
For further reading on each subject, see the entries for the Democratic Republic of the Congo, Belgian Congo, Zaire, the Republic of the Congo, the Congo River and the Congo Free State.