The Bretaye railway station (at 1,800 metres above sea level) can be reached by a narrow-gauge railway from Villars. The backdrop at the start of your hike: Mont Blanc, Dents du Midi and the entire Vaud Alps. The circular route around the Chaux Ronde, a 2,000-metre-high ridge, begins on the south-facing plateau. Just below the Roc à l’Ours rock formation, the trail leads to the picturesque alpine hamlet of Ensex. This section again offers sweeping views of the famous Dents du Midi and to the imposing Grand Muveran.

After the alpine meadows, you arrive at the Col de la Croix (1,778 metres) mountain pass, connecting Villars and Les Diablerets. A particular highlight awaits you here: the pointed gypsum pyramids. Water and wind have eroded these sedimentary geological structures over the years and shaped them into magnificent rock formations. Their karst morphology bears witness to a unique geological history. Surrounded by pristine nature, the route continues to Col d'Encrène and then down to the Perche alpine meadows.

Cows, marmots, and chamois will be your companions on the way to Lake Chavonnes. Continue along the mountain lake, which lies nestled between rock cliffs and unspoilt forests. Legend has it that the lake holds a hidden treasure guarded by the monster of Lake Chavonnes. The white diamonds on the lake's bottom can still be seen twinkling in the moon- or sunlight. In reality, it's a rock encrusted with pyrite, a shiny mineral. The lake below Chamossaire is flanked by beautiful mountain chalets with traditional tavillons (wooden tiles) roofs.