Richat Structure, real colours#
![Richat Structure, real colours Richat Structure, real colours](/attach/Geography/Africa/Mauritania/Pictures/Factbook_Pictures/140mr/140mr.jpg)
Image courtesy of NASA., under PD
The Structure, which has a diameter of almost 50 km (30 mi), has become a landmark for space shuttle crews. Initially interpreted as a meteorite impact structure, it is now thought to be merely a symmetrical uplift (circular anticline) laid bare by erosion.