[Sources consulted: Edward F. Bergman and William H. Renwick, Introduction to Geography—People, Places, and Environment (Englewood Cliffs, NJ: Prentice-Hall, 1999), p. 256; Jost Gippert, TITUS Didactica, at http://titus.uni-frankfurt.de/didact/karten/afr/afrikam.htm]