Castrated male slaves traveled north across this geographic feature from cities like Gao, which were found in the sahel zone just south of it dominated by the Songhai empire.
A travelog of journeys across this geographic feature was written by Heinrich Barth, who studied the Girgam, a record of a kingdom located here. The writings of a diplomat named Leo indicate that, in the 13th to 15th centuries, commerce across this non-aquatic feature started to center more on Walata than Aoudaghost [OW-da-ghost]. Another entrepôt for trade across this feature was found at (*) Sijilmasa [see-jeel-MAH-suh]. The empire of Kanem-Bornu was near the center of this geographic feature. Castrated male slaves traveled north across this geographic feature from cities like Gao, which were found in the sahel zone just south of it dominated by the Songhai empire. For 10 points, merchants traded gold and salt across what desert between Morocco and Mali?
A travelog of journeys across this geographic feature was written by Heinrich Barth, who studied the Girgam, a record of a kingdom located here.
Sahara Desert [accept the Sahel until it is read; prompt on Africa or North Africa] &lt;WA, WorldHist&gt;