Atuel Canyon. Spanish guide service Description: Oasis southern Mendoza, crossing the Valle de Uco, (important crop area), San Rafael city (second largest department in the province), visit the Center, then visit to the island Diament River, bordering the river Atuel bizarre mountain formations, amazing and beautiful produced by the effect of erosion, large valley, hydroelectric, we'll go inside Atuel Canyon, dam the Nihuil, return by the Cuesta de los Calves and villa May 25 (San Rafael founding place).