Sierra de San Pedro Mártir is a mountain range that runs north-south along the middle part of northwestern Baja California, Mexico.

Sierra de San Pedro Mártir National Park is one of the few pine forests that exists on the Baja California peninsula that is important habitat for native Bighorn Sheep.

The National Astronomical Observatory, built in 1971 on a neighboring peak, Cerro del la Cúpula, is home to Mexico's largest optical telescope, with a diameter of 2.12 meters, and a weight of 40 tons in total.

Later the Dominicans continuing the evangelization movement built the Misión San Pedro Mártir de Verona in the southern part of the park, but only ruins are left of the site.

Sierra de San Pedro Mártir National Park was officially created by decree on April 26, 1947, in which 72,909 hectares were set aside and declared protected by the Mexican Federal government.

Sierra de San Pedro Mártir a rugged mountain range with drastic topological changes covered with pine forest and surrounded by large deserts.

The Sierra de San Pedro Mártir Mountain Range has two main climates with an average annual temperature of 20 °C (68 °F).

The lower elevations of the Sierra de San Pedro Mártir are defined by chaparral and desert shrub.

Sierra de San Pedro Mártir is a southern demarcation of the distribution of the California fan palm, Washingtonia filifera.

[7] Throughout the park there are a great variety of mammals: mule deer, bighorn sheep, cougar, bobcat, ringtail cat, coyote, rabbit, squirrel and more than 30 species of bats.