One of the world’s largest known underwater cave systems, total explored length – 270.1 km.
| Location, GPS coordinates: | 20.1625 N 87.4806 W |
| Categories: | Caves |
| Values: | Geology, Visual |
| Rating: |  (4.5 / 5) |
| Where is located? | North America, Mexico, Quintana Roo, some 6 km south from Tulum |
