Cenotes Sac Actún
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Cenotes Sac Actun is Tulum, Mexico’s underwater river cave system, with 259.5 km explored by January 2023.
Why go
- The world’s second-longest underwater cave system as of January 2023, with 259.5 km explored.
- Around 386 km of passages when connected dry caves are included.
- 228 known cenotes connect the system to the surface.
- Human and extinct-animal remains that may be among the oldest evidence of human habitation in the Americas.
Opening hours
Today09:00 – 17:00Show all
Monday10:00 – 17:00
Tuesday09:00 – 17:00
Wednesday09:00 – 17:00
Thursday09:00 – 17:00
Friday09:00 – 17:00
Saturday09:00 – 17:00
Sunday09:00 – 17:00
Don't miss
- Hoyo Negro discoveriesDivers found extinct-animal remains at 60 m and a human skull at 43 m. The human remains were later identified as a teenage girl known as Naia.Hoyo Negro, part of Sistema Aktun Hu2008
Shorts
Interesting facts2
-
Sac Actun means “white cave” in Yucatec Maya.
Sistema Sac Actun - Wikipedia -
2007
Since 2007, Sac Actun and Sistema Ox Bel Ha have often exchanged the title of the world’s longest underwater cave.
Sistema Sac Actun - Wikipedia
History
Connections with neighboring cave systems expanded the surveyed network.
- 1987Exploration began at Gran Cenote, 5 km west of Tulum.
- January 2007A connection with Sistema Nohoch Nah Chich made Sac Actun the longest surveyed underwater cave system at the time.
- January 2011A link with Sistema Aktun Hu brought the surveyed length to 230.8 km.
- August 2012A dry passage was found linking Sac Actun to Sistema Dos Ojos near Nohoch Nah Chich.
- 2018A connection with Sistema Dos Ojos made Sac Actun the longest known underwater cave system at the time. The Gran Maya Aquifer Project, led by Robbie Schmittner, found the link.
Know before you go
- In December 2004, two divers died inside the cave after becoming lost and running out of oxygen.
Sources: Sistema Sac Actun - Wikipedia · Cenotes Sac Actun – Naturalmente Increíble · Sistema Sac Actun - Wikipedia · Sistema Sac Actun - Wikipedia · checked 1 Oct 2026
Where
Carretera Federal 307, Tulum
- Website
- cenotessacactun.com/
- Phone
- +52 998 734 9728
Plan from here: Evening walk →
Questions and answers
What are the opening hours for Cenotes Sac Actun?
Monday, 10:00–17:00; Tuesday–Sunday, 09:00–17:00.
Where is Cenotes Sac Actun?
Carretera Federal 307, Tulum, Quintana Roo, Mexico.
How can I contact Cenotes Sac Actun?
Call +52 998 734 9728.
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