The recently discovered Rio Secreto is an underground river cave full of stalactites and stalagmites that are literally millions of years old. The mineral formations here - and the experience of swim-hiking through them - is truly remarkable.
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How to get there
Km. 283.5, Puerto Juárez, Carretera Federal Libre Chetumal, Ejido Sur, 77712, Quintana Roo, Playa del Carmen