Lake Nyasa, northwards[120] to the celebrated rift valley which lies to the east of the Victoria Nyanza, and contains innumerable lakes, large and small, salt and fresh. This valley, with some interruptions, extends north and northeast till it reaches the shores of the Gulf of Aden.[121] Westward again of this East African rift (which some geologists believe to have been continued with a northwesterly inflection up the Red Sea to the valley of the Jordan) is another less clearly-defined fault, which may have produced the valleys of the Kafue and of the Luapula, and was then continued northwards through Tanganyika to the Albert Nyanza and the valley of the Nile. Various upheavals and modifications broke up the continuity of this western rift valley. The drainage of the Kafue was deflected to the Indian Ocean; that of the Luapula and its lakes and of Tanganyika to the Congo basin. North of Lake Kivu,[122] however, the drainage flowed northward into a vast fresh-water inland sea, which, for want of a better name, we may call the Lake of Fashoda. A parallel to this great circular, shallow sheet of water existed not very anciently in the northern basin of the Congo, and another is to be seen at the present day in the Victoria Nyanza. This last is the largest existing lake in Africa. So far as is known it is shallow compared to such deep troughs as Tanganyika and Nyasa, and is possibly not a very ancient sheet of water as geological age may be reckoned. [Illustration: NAPOLEON GULF, LOOKING SOUTH, NEAR THE OUTLET OF THE RIPON FALLS. [Note the isolated rocks, the remains of a former barrier and fall.]]