<p>North Polar Gypsum Dunes
</p>
NASA/JPL/University of Arizona (less than 5 km across; 320 km above the surface. <a rel="nofollow" class="external text" href="http://www.uahirise.org/PSP_009841_2780">www.uahirise.org/PSP_009841_2780</a>)
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/71688597@N05">UAHiRISE (NASA)</a>
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/uahirise-mars/31729721150/">PSP_009841_2780</a>