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 / 5) |
| 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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