== Revision == 
 this articel need a compled revision Lake Rudolf is Lake Turkana now and the Chad Basin has a size of 2,4 Mio. km², the catchment area of the Chari River extent to 650.000 km² and Petermans Mitteilungen from 1890 is a good source for the 19. century are for the 21. Century? i dont know and some other geographical locations are really failurous, Raas Xaafuun is not the eastern Point on Mainland is located on a Island, the Island is shared from Mainland by a Marshland. The Lake Chad is a Lake not a River Basin and in Section Hydrology, where are the Aquifers and large wetland Areas?  9:00, 22. June 2011 (UTC)