This remote route takes you over the back of the Aiguilles Rouges via Col du Brevent to the hidden Diosaz valley. The entire run goes though nature reserves, so you are likely to see marmots, Ibex and even bearded vultures. There are two refuges and plenty of water along the way. If you want to climb a 3000m mountain, there’s an optional out and back summit – Mont Buet - accessible from the Col du Salenton. Finish with a river-side cruise down to the historic Hotel de Buet, from where you catch the train back to Chamonix.