World’s largest known underwater cave system. Since the discovery of a connecting passage to Dos Ojos system this is the second-longest cave in the world with a length of 371 958 m. Part of the cave is above the water.

Location, GPS coordinates: 20.3177 N 87.4096 W
Categories: Caves, Geographical extremes
Values: Geology
Rating: 5 out of 10 stars
Where is located? North America, Mexico, Quintana Roo, som 13 km north-east from Tulum

Sistema Sac Actún on the map
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