L'Arche Limitrophe (Border Arch) is located on the side of the road D942 between the Village of Aurel (Vaucluse department) and the village of Montbrun (Drome department). It is situated at 665 meters in altitude at Km post 71 between the indicators "see you soon in Vaucluse" and "Welcome to Drome" or vice versa hence the name.  The opening has a measured span of 4.7 meters.