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.

This is one of the most celebrated hikes in Tyrol, connecting two distinct alpine basins. Starting from the Ehrwalder Alm, a broad forest path leads to the Seebensee (1,657m), a turquoise lake that perfectly reflects the Zugspitze (2,962m) on clear days. The adventure continues with a steep, serpentine ascent of another 300 meters to the Coburger Hütte and the moody Drachensee (Dragon Lake). The hut sits on a high rock rib, overlooking both lakes and providing one of the most dramatic mountain vistas in the Mieminger Gebirge.