Natural swimming pools
The entire Yucatan peninsula is formed of limestone and thousands of years ago it was covered by the sea. Limestone's natural permeability and the amount of rainfall have luckily left us with some authentic natural swimming pools called "cenotes" (from Mayan, "Tz'onot"). The Ik-Kil cenote is near the Chichen Itza archeological zone and is gorgeous with fresh, temperate water. It's not too crowded if you avoid the peak season.
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