The Marble Caves (also known as Cuevas de Mármol) are located in the Patagonian Andes, on a peninsula of solid marble. This unique geological formation sits in waters shared by Argentina and Chile, and is only accessible by boat.

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.