The Sac Actun flooded cave system, in the Yucatan Peninsula

Sac Actun's preservation helps maintain the Yucatán Peninsula's natural environment, which in turn keeps visitors coming.

The Sac Actun flooded cave system, in the Yucatan Peninsula
Sac Actun, the first Mexican geosite among the 100 most important in the world. Images and text: UNAM