The first few kilometers take you uphill through the forest towards Naraus. Further up, you reach Cassons, where you can enjoy a fantastic view of the UNESCO World Heritage Site Sardona, a true natural gem. Here you can admire the famous Tschingelhörner peaks and Martinsloch cave – fascinating geological highlights that will leave you amazed.
The trail continues via Segens and Nagens to Crap Masegn, where you can enjoy the impressive surroundings. It then descends to Plaun before heading through the forest towards the finish. Finally, you reach Trutg dil Flem, which takes you through the Flims forest, past the idyllic Lake Cauma, and on to the finish.
The varied route of the K42 offers spectacular highlights and a challenge you won’t soon forget.
Note: At Trutg dil Flem, the route leads through the Stenna Center, which passes through the -6-level parking garage.
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.- |