<p>Winds across the Great Kobuk Sand Dunes create tall ridges, steep slopes and these waves that look like they were made under water. 
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Close view of wave-like patterns in sand.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/41585865@N06">Western Arctic National Parklands</a>
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/nps_wear/8484186651/">Nature Makes Artwork</a>