Yes, Cancun is part of the Mesoamerican Barrier Reef System, the second largest in the world.
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Cancun, Mexico is home to the Great Mayan Reef. The coastal waters of Cancun offer some of the best snorkeling anywhere on Earth. You can swim out right from your hotel beach to snorkel, but you are likely to see more of the seafloor than sea life.
You can swim peacefully! There are no dangerous species near the coasts of Cancun and the Riviera Maya. No shark attack, no jellyfish schools, no sea snakes! Beware of stingrays in the Caribbean Sea.
Although the sea that borders Cancun and the Riviera Maya is known for its beauty, it is not always totally calm! Strong currents and big waves can make some beaches in the Riviera Maya dangerous. You have to watch children while they swim! And even some beaches are only recommended for seasoned swimmers.
Most sharks are not in any way dangerous and should be respected by observing from a distance and not touching, chasing, or harassing. Of the most inquisitive larger sharks, if you feel threatened or worried, always remain facing the shark, stay low, and back off slowly.