<p>In this image many sand dunes are visible. They have an elongated crescent form and are called “barchan dunes.” They are formed by the continuous action of the wind, blowing in the same direction, giving this particular shape.
</p><p>Read more: <a rel="nofollow" class="external text" href="https://www.uahirise.org/ESP_057071_1890">www.uahirise.org/ESP_057071_1890</a>
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NASA/JPL/University of Arizona
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/71688597@N05">UAHiRISE (NASA)</a>
2019-01-25 15:11
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/uahirise-mars/32071252437/">A Dune Field near Nili Patera</a>