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Luna, county, southwestern New Mexico, U.S., bordered on the south by Mexico. It is a region of desert and semiarid plains broken by isolated mountains and mountain ranges, in the Mexican Highland section of the Basin and Range Province. The Continental Divide crosses the western section of the county, which includes the Cooke, Good Sight, Victorio, Cedar Mountain, Florida, and Tres Hermanas ranges and the Carrizalillo Hills. The highest mountains are in the north, topped...