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This jagged karst region in the northeast of Puerto Rico is littered with sinkholes and surreal limestone formations, making it prime spelunking territory. Over 200 caves have been discovered in the region, some capable of swallowing skyscrapers.

The Camuy River is one of the largest subterranean rivers in the world. Experienced cavers can get dirty and wet by climbing, scrambling, abseiling and swimming through the underground river system, but some experience is required to contemplate entering this dangerous terrain.