Within the first few kilometers, you will pass the idyllic, turquoise-blue Lake Cauma, whose unique atmosphere enchants every visitor. From there, the trail leads you through the peaceful surroundings of a dense, idyllic forest, which accompanies you on gently ascending paths towards Naraus. Further up, you will reach Cassons, with a fantastic view of a real natural gem, the UNESCO World Heritage Site Sardona. Here you can admire the famous Tschingelhörner and Martinsloch – fascinating geological highlights that will amaze you.
Via Segens and Nagens, the route continues to Crap Masegn, where you can enjoy the impressive surroundings. The trail finally leads you down to Plaun before you head towards your destination through the forest.
The varied route of the K42 offers spectacular highlights and a challenge you won’t soon forget.
Note: At Trutg dil Flem, the first section (Flims school building – Stenna Center) leads through the Stenna Center, which passes through the -6-even parking garage. You have to take the stairs to the exit to continue on the correct, normal hiking trail.
Saturday, July 18, 2026
9:30 a.m. Flims | 9:00 p.m. in Flims
11.5hrs
Prau la Selva - Lake Cauma - Foppa - Naraus - Cassons - Segnes - Nagens - Crap Masegn - Plaun - Prau la Selva
42.1 km| +/- 2'609
Cassons, Segnesboden, Vorab Glacier, UNESCO Tectonic Arena Sardona, Tschingelhörner
| Phase 1 (until December 31, 2025) | CHF 100. |
| Phase 2 (January 1, 2026 – March 31, 2026) | CHF 130.- |
| Phase 3 (Apr. 1, 2025 – Jul. 17, 2026) | CHF 160.- |