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The surface of Mars has been divided into 30 quadrangles by the United States Geological Survey, so named because their borders lie along lines of latitude and longitude and so maps appear rectangular. Martian quadrangles are named after local features and are numbered with the prefix "MC" for "Mars Chart". West longitude is used.
Relationship of quadrangles to each other:
References
List of quadrangles on Mars Wikipedia(Text) CC BY-SA