If you’re not familiar with a Cenote (pronounced Se-Noh-Tay), once worshiped by the early Mayans as entrance ways to the underworld, they’re large sinkholes that occur naturally in the limestone rock in this area of Mexico. Sometimes they’re open-air pits and sometimes they’re caved in caverns. With the vast network of underground rivers throughout the peninsula. There are dozens of freshwater cenotes from Cancun down to Tulum in the Riviera and all the way to Merida further west in the Yucatan Peninsula. The Sac Actun system, where Dos Ojos and Cenote Manati are located in northeast Quintana Roo, Mexico. Dos Ojos It’s an impressive two sinkholes of 70 meters in diameter connected by a 400 meter long passageway. The visibility through the water is amazing. The water temperature is ideal for snorkeling at a constant 24-25 degrees Celsius (77 Fahrenheit) throughout the year. stunning rock formations, and incredible light effects. A paradise for snorkelers and divers.