Sierra de Ajusco-Chichinauhtzin

The Sierra de Ajusco-Chichinauhtzin is a mountain range in southern Mexico City and Morelos containing dozens of volcanic cones and several prominent peaks. The landscape spans roughly 100 square kilometers and is made of lava, ash, and other volcanic materials.

The mountain range formed roughly two million years ago through intense volcanic activity that transformed the ancient lake basin of Mexico into the current landscape. This geological transformation shaped the land where the Aztec civilization later developed.

The mountain range held sacred meaning for the Aztecs as a connection to their deities of mountains and water. Today, local communities use the paths and forest areas for traditional celebrations that reflect their relationship with the land.

The range has multiple hiking trails and viewpoints accessible from different entry points. Higher areas are noticeably cooler and can be foggy, especially in early mornings or during rain.

The range functions as a vital biological corridor hosting a wealth of forest types and animals adapted differently across elevations, from lower to higher zones. Many of these species occur only in this region and are found nowhere else in the world.