Gran Cenote

CavesQuintana Roo,Mexico

Two pools of glass-clear water in Mexico's Yucatán, snorkelled between under stalactites and turtles, above one of Earth's longest flooded cave systems.

September·Quiet month

Jun–Oct

Rainy season: hot, humid afternoons bring tropical storms, and August to October is the peak of the Atlantic hurricane season. Heavy rain can tint the surface water tea-brown, but the deep water stays cool, clear and full of turtles. Crowds thin, and nothing shuts here at any time of year.

Year-round The twin jungle cenote pools hold clear, cool fresh water year-round, good for snorkelling among turtles and stalactites; come early, before the tour vans arrive, and the dry season is the calmest time.

Gran Cenote is a sinkhole a few kilometres from Tulum, on the Caribbean coast of Mexico's Yucatán, with two pools of glass-clear fresh water joined under a low arch of rock, snorkelled between under stalactites and among turtles, and it opens into one of the longest flooded cave systems on Earth. The Yucatán has almost no rivers; the rain sinks through the limestone and runs underground, surfacing where a cave roof has fallen in, and Gran Cenote is one sinkhole caught at two ages, its open basin where the roof went long ago and its roofed cavern where the roof is still going. You slide into the sunlit pool under the canopy, where freshwater turtles paddle unhurried between the lily pads and silver fish scatter through the shafts of light, and kick past it into the cavern, where the ceiling drops to within a hand's width of the water and stalactites hang down to meet their own reflections, with bats in the dark above. A low arch links the two pools, and swimming through it is the point of the place. The water is so clear that the rock below seems within reach at ten metres, and it is cool all year, which is why the cenote is swum in on the hottest afternoons. Beneath the swimmers the cave goes on. Gran Cenote is a doorway into the Sac Actun system, hundreds of kilometres of flooded passages mapped by cave divers, and in one of those passages was found the oldest, most complete human skeleton in the Americas, a girl who fell into the cave more than 12,000 years ago when it was dry. Divers with lights go through the cenote and out of sight into the dark; snorkellers stay in the two pools. It is a short ride from Tulum and its ruins, and it is busiest in the middle of the day, so the first hour is the calm one. Gran Cenote is a swim in the roof of a cave that runs for hundreds of kilometres, and the turtles keep to the sunlit part.

Worth knowing

Good to know

Arrive at opening to find the turtles — they graze the calm shallows in the early hours and slip into the darker galleries once the pools fill with snorkellers by mid-morning.
Rinse off every cream before you get in — even biodegradable sunscreen and repellent must be showered off first, so the freshwater and the cave life below it stay clean.
Wear water shoes on the slick limestone — the ledges and steps around the pools get slippery, and a life jacket makes the deeper, roofed cavern side easier to explore.

Things to do

1
Snorkel the open pool where the turtles feed
Slide into the sunlit basin under the canopy, where freshwater turtles paddle unhurried between the lily pads and silver fish scatter through the shafts of light. The water is cool and faintly mineral after the jungle heat, and clear enough that the pale limestone blocks several metres down look close enough to touch. Come in the first hour, when the surface is still and the turtles are out.
2
Snorkel into the roofed cavern
Kick past the open pool into the low stone cavern, where the ceiling drops to within a hand's width of the water and stalactites hang down to meet their own reflections. Daylight leaking in from the entrance turns the passage from turquoise to deep green, and your breath echoes off the rock.
3
Swim the passage between the two pools
A low arch of rock links the open basin to the cavern pool behind it. The short swim through it is the best moment here: daylight behind you, cool darkness ahead, and the ceiling dropping to within arm's reach. Take it slowly — the acoustics change halfway through, and the water goes from green to deep blue as the light gives out.

Watch

Nearby

11 km