http://www.archaeologyexpert.co.uk/ArchaeologyfromOuterSpace.html
Archaeology from Outer Space
Rivers in the Sahara
One of the first examples of its excellent use in archaeology was revealed in images taken over the Sahara Desert. This desert is the driest in the world and rapidly expanding. Radar penetration images revealed a sub-surface full of old riverbeds, mountains, valleys, and even expansive lakes. In fact, what lay under the roasting sand was once a landscape typical of Europe or North America.
Global warming srtikes again.......