L'Arche Miracle (Miracle Arch) is located on the same area that La Tour Percée on Hauts de Chartreuse Natural Reserve (Regional Natural Park of Chartreuse) in Isère department of France. The opening has a measured span of 25 meters. The hiking and climbing route was first pioneering by Pascal Sombardier in may 2005. Access to the arch is limited to people able to climbing  on steep terrain and using rope for hand line. Note the rapeller under the arch for scale. IGN topographic map Top 25 number 3334 west La Chartreuse Sud (pleat A9).