Le Trou Roux (The Russet Hole) is located on the ridge of Berard between La Haute Arche de l'Arete de Berard
and La Basse Arche de l'Arete
de Berard in Isere department of France. This massive arch has an estilmated height of 12 meters. There is an old trail to get to the arch but now not signed or maintained. However, it is located by black spot at Trou Roux on IGN topographic map Top 25 number 3334 west La Chartreuse pleat A5.