The small islands on the lake were also inhabited. One of these was Mexicaltzingo, where the leader of Culhuacán allowed the Mexica to live for a while in exchange for military service. Today this area is at the intersection of Calzada de la Viga and Ermita Iztapalapa. Another area, Mixuhca, was a very small island in the lake and where it is said that one of the sons of Moctezuma II was born. The name is derived from Mixiuhtlán, which means “place of birth” for this reason. The Cerro el Peñón de los Baños was a recreational area for Aztec emperors. It contained a number of hot springs with high mineral content believed to be curative.