The Cuenca Alimentadora del Distrito Nacional de Riego 026 Bajo Río San Juan is a protected area in northeastern Mexico.

It extends over part of the northern Sierra Madre Occidental, near the cities of Monterrey and Saltillo.

It adjoins Cumbres de Monterrey National Park to the north, Serranía de Zapalinamé ecological reserve to the west, and Cerro el Potosí ecological reserve on the southeast.

pines and/or oaks are the dominant trees, forming dense forests or open woodlands.

There are also groves of oyamel fir (Abies vejarii) and Mexican Douglas-fir or ayarín (Pseudotsuga menziesii var.