Formed by 6,000-plus years of waves washing up against calcium carbonate, the smooth, swirling blues of the cavern walls are a reflection of the lake’s azure waters, which change in intensity and hue, depending on water levels and time of year.
Located far from any road, the caves are accessible only by boat. Thirty minute tours are operated by a local company, weather and water conditions permitting.
Know Before You Go
There are ferries from Chile Chico that will take you to and through the Marble cave and its tunnels. The caves are based on a lake, and the only way to reach them is by ferry.