In the heart of the Valgaudemar, the Séveraisse Valley penetrates deep into the Écrins massif and is used by climbers setting out to tackle Les Bans, Olan, and other venerable summits in excess of 3 000m, which crowd in like Himalayan peaks. Everything seems wild and untouched by man; don’t miss the Oulles du Diable and the Cascade du Casset.