Cenote Dos Ojos

Cenote Dos Ojos — Two Eyes — is one of the world's most significant underwater cave diving destinations and part of the Dos Ojos cave system, a network of mapped underwater passages exceeding 82 kilometers in length, ranking among the longest underwater cave systems on Earth. Located in the jungle near Tulum in Quintana Roo, the site takes its name from two adjacent sinkholes viewed from above that resemble a pair of eyes separated by a rock bridge. The two main sinkholes — Cenote 1 (the larger, used primarily for snorkeling) and Barbie's Cenote (narrower and primarily for experienced divers) — are connected by a shallow underwater passage navigable by snorkelers. Water in the cenote system is exceptionally clear, with visibility often exceeding 100 meters in the cave passages, and temperature remains a constant 24 to 25°C year-round. A halocline layer — the meeting point of fresh and saltwater where underground marine intrusion contacts the freshwater lens — is visible as a shimmering visual distortion at depth, a phenomenon unique to coastal cenote cave systems. Stalactites and stalagmites formed when the caves were above sea level during ice age sea-level drops hang from ceilings and rise from floors, creating dramatic cavern rooms. Snorkeling is available in the main sinkholes and the connecting passage between them. Full cave diving — penetrating beyond natural light zones into darkened passages — requires cave diving certification; cavern diving within the natural light zone requires a guided dive with a certified cenote guide. Equipment rental and guided snorkel tours are available at the site entrance.