Piz Segnas

On 4 August 2018, a Junkers Ju 52 passenger aircraft operated by Ju-Air crashed near Piz Segnas, Switzerland, while en route from Locarno to Dübendorf. All 20 people on board were killed. It was the first fatal crash of a Ju-Air aircraft since the company began operations in 1982. The cause of the crash was investigated jointly by the Swiss Transportation Safety Investigation Board (STSB) and the cantonal police of Grisons on behalf of the federal and cantonal prosecutors' offices. The final STSB report on the accident, released on 28 January 2021, indicated that the accident was caused by the two highly experienced pilots flying recklessly, disregarding regulations, failing to anticipate expected turbulence, and failing to control the aircraft to prevent it from stalling and spinning into the ground. The report also found that the aircraft was not airworthy at the time of flight, in that the engines were not producing their minimum rated power and that the company had a deficient safety culture of rule breaking.

The Glarus thrust (German: Glarner Überschiebung) is a major thrust fault in the Alps of eastern Switzerland. Along the thrust the Helvetic nappes were thrust more than 100 km to the north over the external Aarmassif and Infrahelvetic complex. The thrust forms the contact between older (Helvetic) Permo-Triassic rock layers of the Verrucano group and younger (external) Jurassic and Cretaceous limestones and Paleogene flysch and molasse. The Glarus thrust crops out over a relatively large area in the cantons Glarus, St. Gallen and Graubünden, due to its horizontal orientation and the high local relief. Famous outcrops include those at Lochsite near Glarus (the town) and in a mountain cliff called Tschingelhörner between Elm and Flims (in the same cliff is a natural hole called the Martinsloch).

Piz Sardona (or Surenstock) is a mountain in the Glarus Alps, on the border between the cantons Glarus and St. Gallen. The 3,056 metre high mountain overlooks the valleys of Elm (Glarus) and Calfeisen (St. Gallen). Less than one kilometre south of the summit lies the tripoint (3,000 metres) between the cantons of Glarus, St. Gallen and Graubünden. The summit itself is the northernmost point above 3,000 metres in Switzerland. The massif is covered by a few small glaciers, the Sardonagletscher lying near the summit on the east side. Piz Sardona is in the Glarus thrust area, a geologic UNESCO world heritage site, named "Swiss Tectonic Arena Sardona". The Foo Pass lies to the north of the Piz Sardona and has a hiking trail from Weisstannen in St. Gallen to Elm in Glarus, forming part of the Alpine Pass Route between Sargans to Montreux.

The Tschingelhörner (also spelled Tschingelhoren) are a chain of mountain peaks in the Glarus Alps, located on the border between the Swiss cantons of Glarus and Graubünden. They are composed of several summits on a 1 km (0.62 mi) long ridge, of which the highest is named Grosses Tschingelhorn (2,849 m). The mountain is located between Elm and Flims, west of the Segnas Pass (2,627 m). East of the main summit is the Martinsloch, a 6-by-18-metre (20-by-60 ft) triangular breakthrough, or hole, through which the sun shines at particular times of the year. The mountain is part of the Swiss Tectonic Arena Sardona and is a UNESCO World Heritage Site.

Piz Dolf (Romansh) or Trinserhorn (German) is a mountain of the Glarus Alps, located on the border between the cantons of St. Gallen and Graubünden. Piz Sardona is to the north across a glacier, and to its west Piz Segnas. Both Piz Segnas and Piz Dolf show the line of the Glarus thrust in its upper part. The easiest access to the area is an aerial cableway to Fil de Cassons from Flims or any of various hikes to this ridge lying southeast of Piz Dolf. One route uses the ascent via Val Bargis (the path can be seen on the picture (right) crossing the southern face of Piz Dolf in vegetation).

The Foo Pass (German: Foopass) is a mountain pass of the Glarus Alps, located on the border between the Swiss cantons of St. Gallen and Glarus, at an elevation of 2,223 m (7,293 ft). It crosses the col between the peaks of Foostock and Piz Sardona.The pass is traversed by a trail, which connects the village of Weisstannen, in the canton of St. Gallen at an elevation of 1,004 m (3,294 ft), with the village of Elm, in the canton of Glarus at an elevation of 977 m (3,205 ft). The trail forms part of the Alpine Pass Route, a long-distance hiking trail across Switzerland between Sargans and Montreux.The alpine pasture below the pass on the St Gallen side is notable for its marmot colony.

The Laaxer Stöckli (also known as Piz Grisch) is a 2,898 metre-high mountain of the Glarus Alps, located on the border between the cantons of Glarus and Graubünden in Eastern Switzerland. It lies approximately halfway between the Vorab and Piz Segnas. The Laaxer Stöckli belongs to the municipalities of Glarus Süd and Laax. The closest localities are Elm and Flims. The south side is part of the Flims-Laax ski area. A chairlift reaches La Siala at a height of 2,806 metres.

The Foostock, also known as the Ruchen, is a mountain of the Glarus Alps, located on the border between the Swiss cantons of Glarus and St. Gallen. It lies north of Piz Sardona, on the range that separates the Sernftal from the Weisstannental.The Foostock lies between two passes that carry hiking trails between the cantons of St. Gallen and Glarus. The Foo Pass lies to the south of the Foostock and carries a trail from Weisstannen in St. Gallen to Elm in Glarus, forming part of the Alpine Pass Route between Sargans to Montreux. The less well known Riseten Pass lies to the north of the Foostock and links Weisstannen with Matt in Glarus.

Fil de Cassons (also known as Cassonsgrat) is a mountain in the Glarus Alps, located near Flims in the canton of Graubünden, Switzerland. The southern face is referred to as "Flimserstein", dominating the appearance of the town of Flims. In its east lies Bargis from where a valley leads to its north face, while to its western face the sliding surface tears off of the biggest visible landslide in the world, Flims Rockslide. Piz Dolf is lying to the north across the Bargis valley, and to its west Piz Segnas, both showing the tectonic line of the Glarus thrust in its upper part, a now UNESCO world heritage. The easiest access to Fil de Cassons is an aerial cableway from Flims to this ridge, that actually allows also walks and an alpine experience from the cablecar for people that would not dare to walk a steep mountain path. Walking on top you will easily identify the tectonic line under your feet, as rocks turn from greenish to bright light grey on top of the wide ridge. For hikers aiming for more than a walk, several routes reach the high plateau and the very wide ridge, among them a historic Via Ferrata called Pinut. One hiking route uses the ascent via Val Bargis and Scala Mola, the path that the cows are being sent up to graze in summer. If you stay at the base of the valley of Bargis, you will hike on a path leading more or less around Fil de Cassons from east to northwest before reaching its top.Being a ridge, there is very often hardly snow, allowing walks even in winter along at least one mile on Fil de Cassons.

The rockslide of Elm (German: Der Bergsturz von Elm) was a mining disaster in Elm, Canton of Glarus, Switzerland which killed 115 people and destroyed 83 buildings on September 11, 1881. The catastrophe was partially caused by the mining of slate, beginning after 1870, by impoverished farmers who sought an additional source of income. Being inexperienced with proper mining techniques, they destabilized the rock face until the final catastrophe. The miners undercut the mountain face to a breadth of 180 m, and already in 1878 first rock movements occurred. A geological commission to examine the increasing number of rockfalls visited the scene shortly before the catastrophe, but did not find any indications of an impending disaster. The loud noise of the rockfalls, break-offs and fractures were already heard during the Sunday service on the morning of September 11, 1881. In spite of this, next to nobody left the dangerous area – in fact, many spectators went to the affected area or climbed to the nearby hamlet Düniberg on the opposing face of the valley in the hope of enjoying a better view of the spectacle. In the late afternoon, after two smaller rock slides, 10 million cubic meters (353 million cubic feet) of slate broke off, travelled 2 km (1.2 mi), and destroyed 90 hectares (220 acres) of land. The slate mine was also completely destroyed. The event and its causes were chronicled in the same year by the local priest Ernst Buss and the geologist Albert Heim in their publication "Der Bergsturz von Elm".

The Fahnenstock (2,612 m) is a mountain of the Glarus Alps, located south of Weisstannen in the canton of St. Gallen.

The Riseten Pass (German: Risetenpass) is a mountain pass of the Glarus Alps, located on the border between the Swiss cantons of St. Gallen and Glarus, at an elevation of 2,189 m (7,182 ft). It crosses the col between the peaks of the Wissgandstöckli and Foostock.The pass is traversed by a trail, which connects the village of Weisstannen, in the canton of St. Gallen at an elevation of 1,004 m (3,294 ft), with the valley of the Krauch stream and thence with the village of Matt, in the canton of Glarus at an elevation of 831 m (2,726 ft).