Loop trail Cassons: Crap la Tgina

The new FlemX gondola lift takes you in comfort from Flims to Cassons at 2,500 metres. This varied circular walk around Cassons takes you right into the Sardona Tectonic Arena, a UNESCO World Natural Heritage Site, and to some of the most impressive geological features in the Alps.

From the viewing platforms, a fascinating view opens up over the upper Segnesboden (Plaun Segnas Sura). The extensive alluvial plain is fed by water and sediment originating from the area of the rapidly retreating Segnes Glacier. The branching streams constantly change course, continually reshaping the landscape.

The Tschingelhörner, with the famous Martinsloch, are also impressive. The striking Glarus Main Thrust – a geological structure unique in the world – is visible along the mountain flanks. It demonstrates how older rock layers were thrust over younger ones and provides important insights into the formation of the Alps. At the same time, it continues to pose a mystery to scientists to this day.

A recent example of the dynamic nature of this mountainous landscape occurred on the Grosses Tschingelhorn: on 4 October 2024, around 100,000 cubic metres of rock came loose, triggering an earthquake measuring 2.2 on the Richter scale. The Martinsloch narrowly escaped damage.

Finally, the walk leads to the viewing platform at the edge of the Flims landslide, the largest known landslide in the Alps. From here, the view stretches across the vast landslide landscape and far out towards the Rhine Gorge.

There are no food options on Cassons. You can stop in Segnes on your way down and enjoy the sun terrasse of the Segneshütte.

Take the FlemX gondola to Cassons, where the one-hour circular hike starts, going in either direction. About half way you can turn off on the path towards Crap la Tgina, from where you can peacefully marvel at the surrounding mountains.