Africa and its inhabitants . ndNachtigal, not more than 850 or 900 feet above sea-level, while its hydrographicfimction is limited to collecting the surroimding waters in a completely landlockedbasin. Its actual extent cannot yet be even approximately estimated, the sourcesand headwaters of its chief affluent, the Shari, being still unknown. Nachtigalstentative calculation of 11,000 square miles for the lake alone is reduced by Rohlfsto 4,500 for the dry, and raised to 22,000 for the wet season. But although thus rivalling in extent some of the other great lakes of the Oldand New Worlds, Tsad
Africa and its inhabitants . ndNachtigal, not more than 850 or 900 feet above sea-level, while its hydrographicfimction is limited to collecting the surroimding waters in a completely landlockedbasin. Its actual extent cannot yet be even approximately estimated, the sourcesand headwaters of its chief affluent, the Shari, being still unknown. Nachtigalstentative calculation of 11,000 square miles for the lake alone is reduced by Rohlfsto 4,500 for the dry, and raised to 22,000 for the wet season. But although thus rivalling in extent some of the other great lakes of the Oldand New Worlds, Tsad cannot compare with them in the depth or volume of itswaters. According to the natives the greatest depth between the shore near Kukaand the Shari mouth, is only the height of two men, and the island of Seyorum,12 miles off the coast, may be reached on horseback. In the deepest parts, sur- LAKE TSAD. 345 veyed by him, Overweg foinid only 20 feet, sf. tliat Tsad is rather a permanent , ?;•? Ilfli ,>I i ? ? ^ *?. inundation than a lake in the true sense of the tenu, in this rt-siKft resen)l)liDgAFRICA II. n n 346 WEST AFRICA. Fig. lyAKE OF TUBUUI. :
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Keywords: ., bookauthor, bookcentury1800, bookdecade1890, booksubjectethnology
