Latitude 90 Degrees North to 90 Degrees South and Longitude -180 Degrees to 0 Degrees

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 Viking Orbiter 1.

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/PIA00194

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