Burundi, or Republic of Burundi, a small, landlocked nation in east-central Africa. It lies just south of the Equator and is bordered by Rwanda, Tanzania, and the Democratic Republic of the Congo. The area is 10,747 square miles (27,834 km 2)—slightly larger than that of Massachusetts.
Most of Burundi occupies a hilly plateau some 4,000 to 6,000 feet (1,200 to 1,800 m) above sea level. In the west are mountains with peaks up to about 8,800 feet (2,680 m). The western slopes of the mountains drop sharply into a major branch of Africa's Great Rift Valley, in which lies Lake Tanganyika. The Ruvironza River is the southernmost souce of the Nile.
Although near the Equator, Burundi has a moderate climate because of its elevation. The weather is tropically warm and humid in the rift valley. Temperatures in Bujumbura, the capital, for example, average 74° to 77° F. (23° to 25° C.) during all months of the year. Rainfall is about 35 inches (890 mm) annually. The weather is cooler and rainier on the plateau.