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Many types of dunes are found in the north circumpolar dunefield. Shown are a field of transverse dunes (left side), a field of barchan dunes (right side), and a zone of transition between them. Transverse dunes are long, linear dunes, oriented perpendicular to the prevailing wind direction, that commonly join with their neighbor in low-angle “Y” junctions. Barchan dunes are crescent-shaped mounds with downwind-pointing horns. The martian dunes are comparable in size to the largest of their terrestrial counterparts. Location: Latitude 78°, Longitude 49°. Viking orbiter photograph 058B28, NGF rectilinear version, clear filter. Click here to view a high-resolution version of the image (1.87 MB)
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