Camuy River
The Camuy River is a river in the U.S. commonwealth of Puerto Rico. It is the third largest underground river in the world and has one of the largest cave systems in the western hemisphere,[1] known as the Rio Camuy Caves.
Coordinates: 18°29′16″N 66°50′13″W / 18.4877218°N 66.8368437°W[2]