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Hotels, dive operators, gear, and how to get here are on the Riviera Maya Cenotes location page.
Overview
Two crystal-clear sinkholes connected by a vast cavern system south of Tulum. Open cavern routes (Barbie Line and Bat Cave Line) keep daylight in view while halocline shimmer and stalactite forests light up under a primary beam. Freshwater, no current, and otherworldly clarity.
Briefing note
Cavern-trained guide required. Stay on the line — no penetration past daylight zone without full cave cert.
What you'll see
3 species curated- rareMexican blind cavefish
- year-roundFreshwater crab
- year-roundCatfish
Sightings evidence
1 record on file- low confidenceMexican blind cavefish
- Last confirmed
- Apr 2026
- Recent records
- 8 within 10 km
Sources & methodology
How we summarise this
We aggregate confirmed occurrence records from GBIF and OBIS within a fixed radius of each dive site. Occurrence records confirm presence and reveal seasonality clustering, but they DO NOT measure per-dive probability — there is no eligible-effort denominator. We deliberately do not publish a numeric '% chance of sighting' from this data.
Sources
- Global Biodiversity Information Facility — GBIF Secretariat
- Ocean Biodiversity Information System — IOC-UNESCO
- OBIS-SEAMAP — Duke University Marine Geospatial Ecology Lab / OBIS
- iNaturalist — California Academy of Sciences & National Geographic Society
- IUCN Red List of Threatened Species — International Union for Conservation of Nature
- WoRMS — World Register of Marine Species — Flanders Marine Institute (VLIZ)
- FishBase — FishBase Consortium
- Atlas of Living Australia — CSIRO / GBIF Australia
- REEF Volunteer Fish Survey — Reef Environmental Education Foundation
Conditions
| Month | Water | Visibility | Current |
|---|---|---|---|
| Jan | 24–25 °C | 30–60 m | none |
| Feb | 24–25 °C | 30–60 m | none |
| Mar | 24–25 °C | 30–60 m | none |
| Apr | 24–25 °C | 30–60 m | none |
| May | 24–25 °C | 30–60 m | none |
| Jun | 24–25 °C | 30–60 m | none |
| Jul | 24–25 °C | 30–60 m | none |
| Aug | 24–25 °C | 30–60 m | none |
| Sep | 24–25 °C | 30–60 m | none |
| Oct | 24–25 °C | 30–60 m | none |
| Nov | 24–25 °C | 30–60 m | none |
| Dec | 24–25 °C | 30–60 m | none |
Season calendar
Peak season highlighted · current month outlined
Gear for this site
Beyond the basic kit- Primary dive light — Cavern interior is pitch dark off the guideline.
- Dive computer — Multiple shallow circuits stack up bottom time.
Next step
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