Cenote Sac Actún
Sac Actún is an underground cave system measured at 347.7km long. This makes it the longest underwater cave system in Mexico and the second longest in the world. While it is completely underground, the entrance is open and provides a small area where you can float in beautiful turquoise water. There is an entrance fee to access this shooting location, which includes a guide, snorkelling equipment and a life jacket. (San Pablo, Quintana Roo, Mexico)
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