This article is about the mountain in Chile. For the settlement in Chile, see: Cerro Castillo, Chile. For the mountain in Ecuador, see Cerro Castillo, Ecuador.Cerro Castillo is a jagged rocky peak located in the Aysén del General Carlos Ibáñez del Campo Region of Chile, within the Cerro Castillo National Reserve. Castillo means castle in Spanish, and the steep basalt walls of the mountain indeed make it look like one. On its sides are a few small glaciers and lakes fed by them.