The Sierra Gorda is an ecological region centered on the northern third of the state of Querétaro and extending into the neighboring states of Guanajuato, Hidalgo and San Luis Potosí.
The area is extremely rugged with high steep mountains and deep canyons. As part of the Huasteca Karst, it also contains many formations due to erosion of limestone, especially pit caves known locally as sótanos. Most of the region has been protected in two biosphere reserves, with the one centered in Querétaro established in 1997 and the one centered in Guanajuato established in 2007. The Sierra Gorda is considered to be the far west of the La Huasteca region culturally and it is home to the Franciscan Missions in the Sierra Gorda World Heritage Site.