“Rocher des Hirondelles” (Swallows’ Rock)

The “Rocher des Hirondelles” (Swallows’ Rock) is an impressive limestone cliff with an airy shape on the edge of the Valserine. Here, the river has made a deep cut into the limestone and shaped this valley in the middle of the Mijoux-Chézery valley. This rock may well be named after the Eurasian crag martin, a master of flying on the hunt for insects, and a species that loves to nest in this type of cliff. This species, which was quite widespread in the Jura during the 19th century, has returned to the Massif since the 1980s.