Original: The Santa Cruz has its headwaters in the high intermontane grasslands of the San Rafael Valley to the east of Patagonia between the Canelo Hills to the east and the Patagonia Mountains to the west , just north of the U.S.-Mexican border .
Simplified: The Santa Cruz has its headwaters in the high intermontane grasslands of the San Rafael Valley to the east of Patagonia between the Canelo Hills to the east and the Patagonia Mountains to the west .