Trou de la Chapelle (Hole of the Chapel) is located on Arête de Lanche Noire (Black Lanche Ridge) above the village of Alex in Haute-Savoie department of France. The west entrance of the cave houses a triple arch followed by a natural tunnel about 50 meters long.The smallest arch has a measured height of 3.5 meters and the medium arch has a height of 5.0 meters. IGN topographic map Top 25 number 3431 west Lac d'Annecy (pleat B7). The cave is located by black spot on the map.