Grotte de l'Enfer (Hell's Cave) is located on Plateau du Parmelan on a vast karstic area called "lapiaz" near the village of Aviernoz in Haute-Savoie department of France. The natural arch located on the cave entrance have a measured span of 9.3 meters. The cave is located by black spot on IGN topographic map Top 25 number 3430 west Mont-Salève (pleat K3).