The
Mont-Blanc Marathon starts in Chamonix and climbs steadily towards
the upper valley, progressively passing through the hamlets of "les
Bois" and Lavancher to reach Argentière (1250m). The trail then heads towards Le Planet and then Montroc. A refreshment post is
available a the top of the Col before finally climbing up to the
Aiguilles des Possettes (2201m) where you will be rewarded by a
breathtaking panoroma of the Mont Blanc range. At the heart of the Aiguilles Rouges massif, opposite the Mont-Blanc range, the route climbs up towards la Flégère (1875 m). The gradient increases until
just before the arrival at Planpraz (2050 m) giving one of the most
beautiful views of the Mont-Blanc. The Marathon has a vertical gain of 2511 meters and an elevation loss of 1490meters.
