Mauritania rooms
-
Richat Structure A 40-kilometre dome of concentric rock rings on the Adrar plateau, read as an eroded alkaline complex and as Plato’s ringed island. -
Dhar Tichitt Hundreds of dry-stone compounds along the Tichitt escarpment, home to herders and millet farmers from about 2000 BC until the 4th century BC, with the order of settlement and the ranking of the compounds still argued.