tributary of the Lualaba River in southeastern Congo (Kinshasa). It issues from the northern end of Lake Mweru, on the Congo-Zambia border, and flows about 220 miles (350 km) northwest past Kiambi to its confluence with the Lualaba River opposite Ankoro. The river is navigable by shallow-draft boats for 100 miles (160 km) in its lower course below Kiambi but contains rapids on its middle course. At Piana Mwanga the falls have been harnessed to generate electricity for the mines at Manono and Kitotolo.