The Chichinautzin Biological Corridor, created in 1988, connects the Lagunas de Zempoala and El Tepozteco National Parks in the Sierra Norte of Mexico. Covering 37,000 hectares, the corridor forms a natural green lung between two major cities: Mexico City and Cuernavaca. The rich biodiversity and endemism in the corridor includes a number of endangered species.
The biological corridor currently faces a number of threats from forest fires, illegal logging and development projects.