Sistema Ox Bel Ha
Flooded cave system in Quintana Roo, Mexico
About
The Sistema Ox Bel Ha (Spanish: sistema, lit. 'system', Yucatec Maya: ox bel ha, lit. 'Three Paths of Water'; short Ox Bel Ha) is a cave system in Quintana Roo, Mexico. It is the longest explored underwater cave in the world and ranks second including dry caves. As of February 2026 the surveyed length is 541.7 kilometers (336.6 mi) of underwater passages. There are more than 160 cenotes in the system.
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