Apart; the Niger communicates directly through the Benue, Lake Tuburi and the Logone with the Shari; the easternmost affluents of the Shari and the most western tributaries of the Bahr el Ghazel affluent of the Nile are within 20 m.
In Ptolemy, too, appears along with Gir (possibly the Shari) a certain Nigir (NL'yap) as one of the largest rivers of the interior; but so vague is his description that it is impossible definitely to identify it with the Niger.'
From Idrisi's description it would appear that he regarded the Shari, Lake Chad, the Benue, Niger and Senegal as one great river which emptied into the Atlantic. 2 That the Niger flowed west and reached the ocean was also stated by Leo Africanus.
North of the Congo basin and separated from it by a broad undulation of the surface is the basin of Lake Chad - a flat-shored, shallow lake filled principally by the Shari coming from the south-east.
In the Laila, and limiting the great parallel basins of the Rion, Ingur and Skenis Shari [= Tskhenis-Tskhali] ..."