Course Description: Starting on the Place de l'Église in Central Chamonix the route climbs via Refuge de Bel Lachat to Le Brévent (2,525m), the runners then descend to Plan Praz. From Plan Praz the course traverses the Aiguilles Rouges to La Flégère and via Lac des Chéserys and Col de Montets to Le Buet (1,330m).