Dunes in Arakao, <a href="https://en.wikipedia.org/wiki/en:Sahara" class="extiw" title="w:en:Sahara">Sahara</a>, <a href="https://en.wikipedia.org/wiki/en:Niger" class="extiw" title="w:en:Niger">Niger</a>
Michael Martin
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>