Whitlock Valley is a mostly north-south 22-mile (35 km) long valley, bordered on the west by the small north-south Whitlock Mountains. The east of the valley is bordered by the north region of the Peloncillo Mountains (Cochise County), a north-south stretch, only about 8 mi wide. The north Peloncillo's form the border between Graham County, northwest, and Greenlee County to the east, (extreme southeast county).