I’m a bit confused by your comment and what you mean by “a tribe here or there has been through it” and that it’s unknown territory? It’s sparsely populated, but according to Wikipedia about 500k people live there, and they’re mostly in urban areas. Surely the lack of data is more down to the political disputes over who governs it? I’d imagine the locals are reluctant to share information with the Moroccan government who they see as the occupiers.