Inter-valley 102 commences from Pont Suaz, in the municipality of Charvensod, it ascends as far as the chapel of San Grato, near Pila, then reaching the lake of Chamolé, through coniferous forests and meadows. It then passes the panoramic Chamolé Pass, and re-descends to the Arbolle Mountain hut, at the foot of Mount Emilius.

The itinerary then proceeds inside charming green valleys, until such time as it surpasses, first, the Arbolle pass (3,155 m)- the highest altitude of the entire itinerary - and then the Laures pass, entering into the wild Grauson gorge, in a section that proposes alpine landscapes with meadows at a high altitude alternated with stoney ground and lakesof glacial origin. The trail then crosses the Saint-Marcel pass, which gives access to the uncontaminated gorge of Druges, then once again ascending as far as the Lavodilec pass, reaching the enchanting Clavalité valley.

From the Medzove pass, it enters into the territory of the Mont Avic regional park, a natural park that spreads out over approximately 5,800 hectares of very beautiful and almost entirely unspoilt territories. Having passed by several reflective pools surrounded by characteristic mountain pine, the itinerary stops off at the Barbustel Mountain hut, before descending, after a brief crossing into the municipality of Champorcher, as far as the chief town of Champdepraz.