Trou Saint-Michel (Hole of Saint-Michel) is located along the huge and impressive eastern cliff of Vercors massif named Grande Roche Saint-Michel in Isère departement of France. An agile person could be climb down through the pit to reach the lower opening with no rope. However, a little rope can be useful for most people. The lower opening exit on a vertiginous balcony in full cliff. The natural arch is located by black spot on IGN topographic map Top 25 number 3235 west Autrans (pleat D10).