evidence: Republic of the Congo, country situated astride the Equator in west-central Africa. Officially known as the Republic of the Congo, the country is often called Congo (Brazzaville), with its capital added parenthetically, to distinguish it from neighbouring Democratic Republic of the Congo, which is often referred to by its acronym, the DRC, or called Congo (Kinshasa). [...] Congo is bounded to the northwest by Cameroon, to the north by the Central African Republic, to the east and south by the Democratic Republic of the Congo, to the southwest by the Angolan exclave of Cabinda, and to the west by Gabon. South of its border with Gabon, the country also has a 100-mile- (160-km-) long coastline along the Atlantic Ocean. [...] The country’s drainage system is dominated by the Congo River. The Congo’s main northern tributary, the Ubangi River, flows southward from the Central African Republic and forms the country’s eastern border as far as the town of Liranga, where it joins the Congo proper. The main river continues southward to Malebo Pool, a shallow 300-square-mile (775-square-km) lake, and then on to Livingstone (Zongo) Falls before turning southwest through Congo (Kinshasa) to the Atlantic Ocean. The major right-bank tributaries of the Congo, all within the Congo Republic, include the Sangha, Likouala, Alima, Nkéni, Léfini, Djoué, and Foulakari rivers.