Located near the entrance to the Sian Ka an reserve (quite a long time from Tulum if you are traveling, although a 20 minute drive if you are in a taxi) is the Cenote Beh Ha.
We have been told that walking along a path of approximately 100m takes you to the entrance of this cenote, and also that it is freely accessible. Scuba diving, swim, --8am - 5pm
Open in google images (Not accurate)
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