The appearance of the dunes in the North Polar Erg (or sand sea) changes as the seasons move from winter to summer. This summer image shows the dunes totally free of frost.
Photo credit: NASA/JPL/Arizona State University
Note: These dunes are located near the eastern tip of Olympia Undae. The closest named feature to this location is Rupes Tenuis, which is to the north. Rupes Tenuis is part of the southernmost cliffs of Planum Boreum.