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Marble Caves of Chile Chico - Carr Austral Puerto, Río Tranquilo, Chile

The Marble Caves were formed by more than 6,000 years of waves crashing up against the calcium carbonate, forming the smooth, swirling cavern walls, which reflect the blue of the water. The colour and hue of the marble changes depending on the water levels and the time of year. The caves are only accessible by boat and thirty-minute tours are offered by a local company between September and February when the ice on the lake melts.