Sistema Ox Bel Ha (from Mayan meaning "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 fourth including dry caves. As of May 2017 the surveyed length is 270.2 kilometers (167.9 mi) of underwater passages. There are more than 140 cenotes in the system.
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