We have many sinkholes in one area of the island.
The largest sinkhole is the Camuy cavern. It is so
huge we ride a rubber wheel train in a spiral road to the
bottom, 400 feet down. Then we enter the cavern itself. Really interesting:
"Only a small part of the complex is open to the public, three crater-like sinkholes and two caves. But what a spectacular part it is! Visitors ride a trolley that descends into a sinkhole lined with dense tropical vegetation while your guide describes the sights. After a walk across ramps and bridges and through the dramatically illuminated, 170-foot high Cueva Clara, lined with beautiful tropical vegetation. Another tram shuttles you to a platform overlooking the 400 foot deep Tres Pueblos Sinkhole. The walls are covered with petroglyphs carved by the ancient Tainos.
The Camuy River is responsible for creating one of the largest cave systems and the third largest underground river in the world.When the Camuy River vanishes into the Blue Hole near the town of Lares, it begins a subterranean journey through one of the most massive cave networks in the world.The river runs through a network of caves, canyons and sinkholes that have been cut through the limestone karst base in this region over the course of millions of years.The caves were probably known to the Pre-Colombian TaĂno indians and later to the local farmers but only came to the attention of spelologists in the 1950's.The Puerto Rico Land Administration developed and opened the area in 1987. Visiting the caves is like being transported to other dimension...