Natural Protected Area Cañón de San Cristóbal is a topographic formation consisting of cliffs that form depressions and deep valleys, as a result of the erosion of rocks by the passage of the waters of the Usabón River. Due to the continuous failure, erosion, dissolution, and detachment of rocks, puddles and waterfalls have also formed that run through the Protected Natural Area. The composition of this topographic and geological phenomenon is a mostly sedimentary and igneous rock, belonging to the Late Cretaceous. For its part, the igneous rock is of volcanic origin and is about 100 million years old, while the sedimentary rock, formed by the sediment deposit is about 90 million years old.
The Usabón River, the protagonist of the San Cristóbal Canyon, covers approximately 9 kilometers and eventually joins the La Plata River basin in the municipality of Cidra. The San Cristóbal Canyon Natural Protected Area has buffer zones approximately 1,800 feet wide and up to 800 feet deep in some areas.