The Sierra del Ajusco-Chichinauhtzin, (Ajusco-Chichinautzin Mountain Range) also known as Serranía del Ajusco or Sierra de Chichinauhtzin, is a Mexican mountain range located between Mexico City and the states of Morelos and Mexico. It makes up the southern part of the mountain necklace that surrounds Mexico City. It is made up of more than one hundred volcanic cones, among which are: Tláloc ( MAMSL), Chichinauhtzin (, Xitle (, Cerro Pelado ( and Cuauhtzin (. Its maximum height is at the Cruz del Marqués peak on the Ajusco volcano ().