Between 1874 and 1877 Henry Morton Stanley traveled Central Africa east to west, exploring Lake Victoria, Lake Tanganyika and the Lualaba and Congo rivers. He covered 7,000 miles (11,000 km) from Zanzibar in the east to Boma at the mouth of the Congo in the west. The expedition resolved several open questions concerning the geography of Central Africa, including identifying the source of the Nile, which he proved was not the Lualabab and is in fact the source of the Congo River.