A massive underground river flows beneath the Yucatan Peninsula
The Yucatan Peninsula sits atop the world's most extensive flooded cave systems, where vast networks of freshwater rivers carve through limestone to create a hidden, subterranean wilderness.
Mexico is home to the Sac Actun and San Actane systems, which together form a sprawling underwater labyrinth spanning over 215 miles. These submerged rivers flow through porous limestone bedrock, connecting thousands of sinkholes known as cenotes.
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