Circuit des 25 Bosses

The 'Circuit des 25 Bosses' (The 25 Bumps) is located in the Massif des Trois Pignons, on the western edge of the Forêt de Fontainebleau. Originally established in the 1970s as a training ground for alpinists, this technical 16km loop remains one of the most demanding day hikes in the Île-de-France region. The trail requires hikers to cross 25 distinct sandstone ridges, involving frequent scrambling over boulders and navigating deep sandy paths. It is an intense physical challenge characterized by constant elevation changes and a unique ecosystem of maritime pines and white sand dunes. Note: Compiled from public sources — not a field report.

Standing as a natural balcony opposite the demandingly vertical walls of the Hochkönig (2,941m), the Hochkeil is an approachable peak that offers one of the best effort-to-view ratios in the Salzburger Land. Starting from the Arthurhaus alpine inn, the trail winds through lush high-alpine meadows and scattered pine trees to a broad, flat summit across from the 'Mandlwände'. Because the area is often overshadowed by the more famous Königssee or Zell am See, the Hochkeil remains remarkably quiet and popular with locals.