Ruinaulta

46°48′29″N 9°18′54″E / 46.808138°N 9.314947°E / 46.808138; 9.314947

Ruinaulta, also known as the Rhine Gorge, is a canyon in the canton of Graubünden (Grisons), Switzerland, carved by the Anterior Rhine between the villages of Ilanz/Glion and Reichenau. It was formed by the prehistoric Flims rockslide, which blocked the river and eventually gave rise to the present-day gorge.

The Ruinaulta extends for about 14 kilometres and is characterised by white cliffs, forested slopes, quiet lakes, and varied habitats supporting a diversity of plant and bird life. It can be explored on foot, over water, or by bicycle, and the Rhaetian Railway passes through the gorge, with stations at Valendas-Sagogn and Versam-Safien.

Ruinaulta lies within the Swiss Tectonic Arena Sardona, which was inscribed as a UNESCO World Heritage Site in 2008.

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