Sistema Sac Actun
CountryMexico
RegionQuintana Roo
DiscoveredVarious
Size/Depth386 km surveyed
About Sistema Sac Actun
The second longest cave system in the world and the longest underwater cave. Located in the Yucatan Peninsula cenotes. Connected two previously separate cave systems in 2018. Contains Maya archaeological artifacts. Diving here requires technical cave diving certification.
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