Fil de Cassons

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 Tristelhorn (also known as Piz da Sterls) is a mountain of the Glarus Alps, located on the border between the Swiss cantons of St. Gallen and Graubünden. Reaching a height of 3,114 metres above sea level, it is one of the highest summits in the canton of St. Gallen. The Tristelhorn is located west of the Ringelspitz, on the range separating the Calfeisen valley (St. Gallen) from the Rhine valley near Flims (Graubünden).

Flims (Romansh: Flem) is a municipality in the Imboden Region in the Swiss canton of Graubünden. The town of Flims is dominated by the Flimserstein which one can see from almost anywhere in the area. Flims consists of the village of Flims (called Flims Dorf) and the hamlets of Fidaz and Scheia as well as Flims-Waldhaus, the initial birthplace of tourism in Flims, where most of the hotels were built before and after around 1900.

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 Segnas is a mountain in the Glarus Alps, located on the border between the cantons of Glarus and Graubünden. Piz Sardona is on the same ridge to the north, from where the Trinserhorn or Piz Dolf lies to the southeast. The Tschingelhoerner with the famous Martinsloch (hole of St.Martin) lies to the west, with the Pass dil Segnas between the two mountains.The mountain lies in the municipalities of Flims, in the canton of Graubünden, and Glarus Süd, in the canton of Glarus. The nearest settlements are the villages of Flims, to the south, and Elm, to the west. A path crosses the Pass dil Segnas between the two villages. The easiest access to the area is an aerial cableway to Fil de Cassons (not active since 2015)from Flims or the hike to this ridge lying southeast of Piz Segnas.On 4 August 2018, a Junkers Ju 52 aircraft, operating a sightseeing flight, crashed into the western flank of the mountain, killing all 20 persons aboard.

Lag Prau Pulté is a lake at Flims in the canton of Grisons, Switzerland.

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.

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.

Lag Tuleritg is a lake at Flims in the canton of Grisons, Switzerland.

Caumasee (Romansh: Lag la Cauma or Lai da Cauma) is a lake near Flims, in the Grisons, Switzerland. It is one of the lakes on the Flims Rockslide deposits. The lake is fed from underground sources. Its surface area is 10.3194 ha. The level of the lake varies by approximately 4 to 5 meters along with the varying underground water flow during the year, hence reaches its minimum by the end of April when snow melting in the mountains increases. A maximum level is reached by mid July but may be topped in August even after previous falling due to summer rain. The very western bay never freezes in winter, probably showing a maximum water flow in this area. When the lake is at a low level, with a small volume of water, it warms up sooner than most lakes in the region, so people can be seen starting to swim the lake in April while bigger lakes even in lower areas of Switzerland remain rather cool. Water temperature in summer is at an average 21 Celsius, with a maximum around 24 Celsius. The lake is in a huge forest that was allowed to remain on the agriculturally useless debris area of the biggest prehistoric rockslide in the Alps and can only be reached by a footpath (wheelchair accessible), possibly using Caumasee-Lift, a funicular built in 1939, refurbished in 1988 on its original tracks (running May to October only). The walk from the edge of town to the funicular takes about 10 minutes.

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.

Crestasee (Romansh: Lag la Cresta) is a small lake shared by the municipalities of Flims and Trin in the Grisons, Switzerland. From 1892 a guest house on its northern end served as pension and still is a restaurant today in its original state. There is no tributary to the lake. The rough character of the whole area derives from being a debris area of the gigantic Flims Rockslide, where waters flow underground until feeding lakes at certain spots such as Crestasee, Caumasee or Lag Prau Pulté. Less than 100 yards (91 m) from its northern end a gorge called "Felsbachschlucht" is formed by river Flem, coming from Flims, whose Romansh name is also Flem. The waters from the lake and river are independent, and of course the river had only some 10 000 years to create the gorge as this is the age of the rockslide. The water from the lake forms a small stream and enters the Flem river after a very short run, not called a special name for its short length. In summer it is well known for swimming and offers facilities (such as a kiosk, toilets, changing room, boats and SUP's to rent) to enjoy this. An entrance charge will be collected by an employee of the restaurant, walking around the lake once or twice a day. Crestasee can be reached from Flims via the Felsbachschlucht gorge or wide forest paths, as well as from Trin Mulin or the public post car stop Felsbach/Crestasee on the main road, to where it is connected by a nice and short path. Motorists have to walk a similar distance to the lake, as there is no access to the lake by car and signposted parking is well off the lake. A forest walk leads to Conn, to see the Ruinaulta gorge formed by the Rhine, still within the same huge rockslide debris area, or to the Lag la Cauma.