THEMIS: More polar dunes

Polar dunes swarm around hills (THEMIS_IOTD_20140721)THEMIS Image of the Day, July 21, 2014. This VIS image shows part of the large dune field called Olympia Undae. There are hills in this region, and the dunes are concentrated in the lower elevations.

More THEMIS Images of the Day by geological topic.

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