Nature reserve Heidiland

UNESCO Welterbe Tektonikarena Sardona

How mountains rise


The imposing mountain ranges of the Tectonic Arena Sardona, UNESCO World Heritage Site, are a unique example of the formation of the mountains. In the fascinating mountain landscape around the Piz Sardona in the border area of the cantons of St. Gallen, Glarus and Graubünden, tectonic processes can be observed in a vivid, globally unique way. Along the line visible from afar, the "Glarus Main Overthrust", 250-300 million year old rocks pushed over a distance of about 40 kilometers onto much younger, 35-50 million years old rocks. The 300 km2 area is a witness to mountain formation and of great educational and scientific importance. The fascination of this landscape can be experienced up close on various hiking and biking trails, when visiting one of the interesting geological sites or on a geological tour. The Sardona World Heritage Trail leads hikers from Filzbach to Flims through the heart of the area.


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