Step beneath the Riviera Maya’s jungle canopy to swim an underground river carved through limestone. This guided cavern tour from Playa del Carmen pairs geology and Mayan history with hands-on exploration and hotel transport.
More ways to explore the area's outdoor wonders
A low concrete jetty slides you past jungle brush and into cool, dim light—the air smells of wet limestone and ferns. An expert guide clicks on a headlamp and leads a small group over slick ledges into a cavern where a slow, clear river threads between stalactites and columns. Water nudges at your ankles; the river seems to dare you to follow.
Difficulty
moderate
Duration
5–6 hours
Fitness Level
Moderately fit: able to walk uneven ground, swim short distances, and perform a brief rappel.
Wildlife
History
The underground rivers and cenotes were central to Mayan life—both as freshwater sources and sacred places—while the region’s karst limestone formed over millions of years.
Conservation
Operators limit group sizes, provide lockers for belongings, and ask visitors not to touch formations or enter the water with lotions to protect fragile mineral structures and water quality.
Reserve your spot on the Discover the magnificent “Secret River” of the Riviera Maya. Transport included today and enjoy a trusted, highly rated experience designed to help you make the most of your adventure.
Bring water shoes
Stony, wet surfaces in the caves are slippery—closed-toe water shoes or sturdy sandals improve traction and protect toes.
Use biodegradable sunscreen
Apply reef-safe, biodegradable sunscreen before entering the jungle to protect cave water quality and local aquatic life.
Pack a quick-dry change
Bring a dry set of clothes and towel in a waterproof bag for the return van—you’ll want to be comfortable after swims and the lunch break.
Arrive ready to follow instructions
The route includes a short rappel and confined passages—listen closely to the certified guide for safety and conservation rules.
Water shoes
Provide grip on wet limestone and protect feet during cave swims.
Biodegradable sunscreen
Prevents sunburn in the jungle without contaminating cave waters.
summer
Lightweight towel and quick-dry change
Keeps you warm and comfortable after swimming and before the return trip.
Waterproof small bag or dry sack
Protects phone, ID, and cash from splash while you explore the river.