I don’t know about Sahara and its ancient rivers but recently a small country in the Western Sahara region called Mali is on my mind. Some suspicious activities of big players are going on there. Everybody is trying to put its foot there. From Putin sponsored guns for hire called Wagner Group, recent German official travel and long-standing ever-growing US, UK, France positions there. Even small Poland is trying its luck there. Qui bono? Uranium and rare earths?
Maybe but country is small, and their deposits are not that great. Then why? Personally, I like to dabble in some HOS as far as Mali and its medival time history that is least to say unusual for African country. Just the wiki info about Mansa Musa empire can spin dozens of conspiracies theories. For example, his trip to Mecca thru Egypt, where he spent so much gold that after he left Egypt experience similar inflation as couple of hundred years later Cortazar Spain.
Why did he first spend 3 days at Giza? Why most of gold was spent in Egypt instead of Mecca a final destination for hajj? Why upon return he started to build mosqes in a shape of pyramids, and on and on I could go.