A thousand years elapse, and bring us to Edrisi, an Arab geographer, 1154 A.D. Some little information has been gained in the meanwhile of the Dark Interior. The Mountains of the Moon are prominent now, but several degrees south of the equator. Two of the lakes discharge their surplus waters to a third lake, which is north, whence the Nile issues, flowing northward towards Egypt. We see in it the results of geographical conferences, and many inquiries from ivory traders.
Four centuries later we see, by the following map, that the lakes have changed their position. Ambitious chartographers have been eliciting information from the latest traveller. They do not seem to be so well acquainted with the distant region around the Nile sources as those ancients preceding Edrisi. Nevertheless, the latest travellers must know best.