A bold paint stroke on a busy purple canvas is actually part of the <a href="https://en.wikipedia.org/wiki/Dasht-e_Lut" class="extiw" title="en:Dasht-e Lut">Dasht-e Lut Desert</a> in southeastern Iran. The linear features are <a href="https://en.wikipedia.org/wiki/Yardang" class="extiw" title="en:Yardang">kaluts</a>, huge rocky formations shaped by wind erosion. The streamlined forms vary in size, but some kaluts stretch more than 100 kilometers (62 miles).
U.S. Department of the Interior, U.S. Geological Survey
2014-06-12
<a rel="nofollow" class="external free" href="https://www.usgs.gov/media/images/wind-power">https://www.usgs.gov/media/images/wind-power</a>