The Pas de Chavanette, universally known as the Swiss Wall, is the most notorious piste in the Portes du Soleil and arguably the most photographed black run in the Alps. It drops from the ridge between Switzerland and France down towards Avoriaz, beginning with a near-vertical face of huge bumps before settling into a long mogul field below.
The Wall is reached from the top of the chairlift above Les Crosets and is technically marked as a black piste, but in practice it is closer to off-piste skiing — the moguls are enormous and ungroomed, and bad falls are common. The locals' rule of thumb: if you can ski every black run in the Portes du Soleil without hesitation, you can try the Wall. If not, take the lift back down and watch from the top.