 Due to the region lying on the eastern, or leeward, side of the Andes and west of the Sierra de Córdoba, it experiences very little rain.These rain shadow effects are the primary reason for the aridity of the region and the formation of the Monte and other nearby deserts.Although a difference between this desert and the other two deserts is the lack of intensity of effect from the cold water currents off the South American coast for the Monte Desert.