Cajón del Maipo is a canyon located in the Andean southeastern portion of Santiago. It encompasses the upper Maipo River, where the river has entrenched itself in a narrow valley.  At the end of Cajón de Maipo, on the Chile-Argentina border, about 90Km from Santiago and an altitude of 5856 meters (19,213 feet) is the San José Volcano it last erupted in 1960.,a magnificent landscape Magnificent CanyonCajón del Maipo is a canyon located in the Andean southeastern portion of Santiago. It encompasses the upper Maipo River, where the river has entrenched itself in a narrow valley. At the end of Cajón de Maipo, on the Chile-Argentina border, about 90Km from Santiago and an altitude of 5856 meters (19,213 feet) is the San José Volcano. UpriverMaipo Canyon with San Jose Volcano in the background. A typical scenery of the Andes ion central Chile. less than two hours driving from the city!