Begin at Refuge Vallanta (1).
Climb leading to Col de Vallanta 2811 m (2). It's a steep climb but with a stunning view of Monte Viso. After crossing several neves, head down through the scree towards Refuge du Viso. The high berm is a beautiful valley with a view of Monte Viso, Col Sellière which you climbed two days ago and you can also make out Col de la Traversette.
At a crossing (3), shortly after having passed the refuge, take a left leading to "petit belvédère du Viso" then the Roche Écroulée.
Next follow the forest trail or the path leading to Echalp hamlet (4) through Guil valley.