This is one of the most scenic routes along the Chamonix valley starting at Les Houches just across the river. The starting point is the GR5 (and HexaTrek) point no 1 at Les Houches (pic 1). The route follows the GR5 up past Parc de Merlet and continues to Refuge Bellachat before coming to the rim and Le Brevent. This is by far the most elevation of the route, 1500 m in 9 km and pose ever more magnificent views of the Chamonix valley below, as well as glaciers on the other side.