San Cristobal Canyon is A NATURAL PROECTED AREA AND the only volcanic rift in Puerto Rico. approximately 650 feet down to the bottom. The San Cristobal Canyon is somewhat off the beaten track and not that easy to locate, but locals will be able to guide you; those who have ventured in San Cristobal Canyon will tell you that it is well worth the effort. THE CLEAR BLUE WATERS AND DEEP DIVING MAKES THIS LOCATION ONE OF THE MOST GLORIOUS PLACES TO VISIT IN THE CARIBBEAN.