Bujumbura, formerly Usumbura, is the largest city and main port of Burundi. It ships most of the country's chief export, coffee, as well as cotton and tin ore.
Wikipedia

Burundi , officially the Republic of Burundi , is a landlocked country in the African Great Lakes region of East Africa, bordered by Rwanda to the north, Tanzania to the east and south, and the Democratic Republic of the Congo to the west.
Wikipedia