The Gastlosen are a mountain range of the Swiss Prealps, lying between the cantons of Fribourg, Bern and Vaud. They form a 12 km chain stretching from Jaun to Rougemont, culminating at the Dent de Savigny, elevation 2,252 m, just south-west of the Dent de Ruth, where the three cantonal borders meet.
The Trophée des Gastlosen is a competition of ski mountaineering which takes place in the area.
Wikipedia https://en.wikipedia.org/wiki/Gastlosen
Address 1656, Switzerland
Coordinates 46°33'48.338" N 7°15'35.041" E