The Petit Envers du Plan is a great route of the Vallee Blanche with some sustained slopes.
You'll ski through some amazing ice formations, as the Petit Envers takes you into the middle of a labyrinth field of crevasses and séracs. You'll have the chance to ski some lovely slopes with few tracks on them, all set against the backdrop of the Talèfre and Géant glaciers. It's a route that is for strong skiers only.