The north polar residual ice cap of the Planum Boreum region, which is cut by spiral-patterned troughs, is located at top of this image from NASA's Viking Orbiter 1.
http://photojournal.jpl.nasa.gov/catalog/PIA00198
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Details
Title: Center is at Latitude 30 Degrees North, Longitude 270 Degrees
Creator: NASA/JPL/USGS
Date Created: 1998-06-08
Rights: JPL
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