Manuel Antonio Ay, Italy
Choo-Ha, Tankach-Ha and Multun-Ha are a series of small cenotes close to the Mayan site of Cobá in central Yucatán Peninsula. All of them are accessible to the public for swimming. Choo-Ha has a small entrance of only about 3 by 4 meters.
Listen to the audio guide for Choo-Ha Free on WIP — starts by itself when you arrive, even with the screen off