A steep walk to a natural rock arch, the Trou de la Mouche (Fly Hole). The section up to the Trou is steep and loose in places, the initial descent is also steep but soon eases off. This route, although shown on IGN maps, is not marked with paint flashes. Signposts at the start of the route make this clear so make sure you have a map and compass.
The walk is best done in the direction described, and best done a clear, dry day.