Burundi bəro͞on´dē [key], officially Republic of Burundi, republic (2005 est. pop. 6,371,000), 10,747 sq mi (27,834 sq km), E central Africa. It borders on Rwanda in the north, on Tanzania in the east, on Lake Tanganyika in the southwest, and on Congo (Kinshasa) in the west. Bujumbura is the