The RKH Westafrika Sahelländer covers all the Provinces du Sud on a 1:2.2 million scale. Shows some more geographic features, but still a very small scale.
As Chris says, search online for various MINURSO maps, also sketches of bird-watchers like Go-South can be interesting.
Also pre-ordered a copy of the new Gandini Atlantic Sahara, big hopes as the new design of his updated guidebooks and maps makes them finally a pleasure to read and use. You can have a preview here, looks promising.
Good luck.
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