L'Arche Sud du Malpasset is located on the south side of "Grande Tete de L'Obiou" (Obiou peak) in Devoluy massif, Isere department of France. The outstanding arch has an estimated height of 12 meters. The arch perched up on a delicate stepped row is totaly inaccessible in summer and require a mantle of snow to help to climb to the opening. Top professionnal mountaineer Pascal Sombardier and the author take 9 hours round trip to get to the arch located at 2500 meters above sea level. The enjoyable trip to the arch is related here. IGN topographic map Top 25 number 3337 west "Devoluy" pleat C2.