
Reading Barzakh, a fantasy/SF novel by Mauritanian author Moussa Ould Ebnou. Doing a bit of research on Aoudaghost/Awdaghost, a city lost to the desert in the Middle-Ages, and on the Sahel region is helping a lot w/ timeline & geography.
Pic by Luca Abbate from https://wildmanlife.com/aoudaghost-economic-hub-of-the-sahara/ This page contains pics & detailed info & matches quite closely the descriptions in the book. Useful.