Cave, semi-open or open: the cenotes near Cancun
Every cenote is a hole in limestone that reaches groundwater, yet a sunny open pool and a dark cave river feel like two different worlds. The shape decides the light, the mood and how easy it is to swim. This guide sets the three kinds side by side and names the trips from Cancun that visit each.
How a cenote forms
The Yucatán Peninsula is a flat slab of limestone with almost no rivers on the surface. Rain soaks straight down, turns slightly acidic and slowly dissolves the rock into caves filled with groundwater.
When a cave roof weakens and falls in, the water below is exposed, and that opening is a cenote. How much of the roof has gone decides which of the three kinds you are looking at.
A well-known theory links a ring of cenotes in the north of the peninsula to the Chicxulub impact crater. The cenotes near Cancun are not on that ring, but they come from the same porous rock.
Open cenotes, pools under the sky
An open cenote is the oldest stage, where the roof has collapsed completely. What is left is a round pool with rock walls, open to the sky and often ringed by jungle and hanging roots.
The jungle cenotes on the three hidden cenotes trip at ~$39 include open-air pools with a zipline and a jumping platform. Cenote Chichikan, the swim stop on the Chichén Itzá day, is an open cenote too.
Open cenotes are the brightest and usually the warmest-feeling. They suit nervous swimmers and children best, and the Ruta de los Cenotes has several of them close together.
Semi-open cenotes, half in shade
A semi-open cenote is a cave whose roof has partly fallen. Part of the water lies under a rock overhang and part lies in daylight, so you can swim from sun into shade in a few strokes.
The Mariposa cenote at Canamayte, on the Tulum and turtles day at ~$89, is this kind. Our guide to the Tulum, cenote and turtle trip covers the rest of that day.
This shape often gives the best photographs. Light enters through the opening and falls on the water under the overhang, while the shaded part stays cool and calm.
Cave cenotes and underground rivers
A cave cenote is still mostly roofed, with only a small opening or none at all. Inside you find stalactites hanging from the ceiling, stalagmites rising below them and water that can run for long distances between chambers.
Rio Secreto at ~$89 is the clearest example near Cancun. You walk and swim through a semi-flooded cave in a wetsuit, life vest, water shoes and a hard hat with a headlamp, with a bilingual guide leading the group.
For the cave, not the sky
Rio Secreto's guided route through a flooded cave near Playa del Carmen, with gear and a light lunch included. Transport is an option on GetYourGuide.
Caves are not for everyone. Rio Secreto is not for pregnant women or people with claustrophobia, and our guide to Rio Secreto describes the route.
Light, temperature and mood
| Type | Light | Feel of the water | On these trips |
|---|---|---|---|
| Open | Daylight, brightest near midday | Usually the warmest-feeling | Tours 1, 4 and 5 |
| Semi-open | Sun at the opening, shade below the rock | Cooler under the overhang | Tour 3 (Mariposa) |
| Cave | Headlamps, a few shafts at openings | Coolest, often still | Tour 2 (Rio Secreto) |
Cenote water usually sits around 24–26 °C (75–79 °F) in all three kinds. It feels colder in a cave because the air is cooler and there is no sun on your shoulders.
Open cenotes are at their brightest when the sun is high, around late morning to early afternoon. Caves light up only by headlamp, apart from shafts of daylight where an opening exists, so never book a cave for sun rays.
Light and crowds are covered in our guide to cenote timing. For depth and the safety side, see how deep and how cold cenotes are.
Sacred wells to the Maya
For the Maya, cenotes were the main source of fresh water in a land without rivers. Many were also seen as openings to the underworld and used for offerings, and several large towns grew up beside one.
Guides on most trips touch on this, and the tour 1 day includes a traditional Mayan ritual. It helps to remember that some cenotes are still meaningful to local communities, so follow the house rules at each one.
Parks, not wild pools
Nearly every cenote you reach on a tour from Cancun sits inside a park or reserve. Someone owns the land, charges entry, builds the stairs and sets the rules for showers, life jackets and jumps.
That is good news for safety and comfort, with ladders, platforms and staff who watch the water at most parks. It also means the scene is shared with other groups, and a famous open cenote can feel busy by late morning.
Cave cenotes keep groups smaller by design, since a guide leads each party along a fixed route. Open pools have no such limit, so an early start is the simplest way to find one quiet.
Which shape to choose
- First swim, children or nervous swimmers: an open cenote on a short trip
- Photos with light and shade: a semi-open cenote
- Rock formations and a sense of exploring: a cave or underground river
- A bit of everything in one day: the Tulum day, or two separate half days
If you have only one morning, start open and save the cave for a second trip. Our page on cenotes with kids sorts the five tours for families, and our price guide shows what each adds in fees.