Center is at Latitude 30 Degrees North, Longitude 30 Degrees

The north polar residual ice cap, which is cut by spiral-patterned troughs, is located at the top in this view from NASA Viking Orbiter 1.

The north polar residual ice cap, which is cut by spiral-patterned troughs, is located at the top in this view from NASA's Viking Orbiter 1. http://photojournal.jpl.nasa.gov/catalog/PIA00192

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