Mexico, Quintana Roo, Cancun
Spend a day in Puerto Aventuras exploring the underwater world of cenotes, the largest underground cavern system in the world. See the fascinating limestone structures in these caves beneath the waves, all just a short distance away from Cancun. Swim around submerged stalactites and stalagmites, and see the spectacular, natural phenomenon of haloclines, a blending of fresh and salt water, all safely lead by an expert guide.
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