The trail runs around the Mont Blanc Group, passes through three countries (France, Italy and Switzerland) and is part of the GR long-distance hiking trail network. The length is about 170 km with an altitude of about 8,000 meters. It is usually covered counterclockwise in seven to ten days.
On the French side, the trail leads from the Arve Valley (with the main towns of Chamonix and Les Houches) through the Val Montjoie and its center Les Contamines-Montjoie to the Vallée des Glaciers, which belongs to the municipality of Bourg-Saint-Maurice. From the hamlet of Les Chapieux, one then crosses the Col de la Seigne to reach the Rifugio Elisabetta Soldini Montanaro in Italy and then through the Val Veny to Courmayeur. The route then heads northwards through the Italian Val Ferret via the Col Ferret into the Swiss Val Ferret to Champex-Lac.
Various variants run south from Martigny to Trento VS; the high alpine route leads over the Val d’Arpette and the 2665 m high Fenêtre d’Arpette. From Trento, in turn, there are various pass routes back to France.