This image is from the Tanezrouft (waterless plains) region of southern Algeria, just south of the Psychedelic image. Although there is evidence of erosion by water in the image, aeolian processes are responsible for many of the features seen here since this area averages no more than 3 inches of rainfall per year. A common misconception about the Sahara desert is that it is mostly sand dunes. In fact, more of the Sahara is like this: rock outcrops with some sand and a dry gravel surface that can be very abrasive when the wind blows.

The area covered by this image is approximately 49x84 miles. A full-resolution crop of the image file is available here that shows the detail present in the full image print.