Starting from Cize or Corveissiat (L5), a loop over the Corveissiat plateau and coombs via the côte du Fay and the Chatillon cliff, where the old maquis hides. Passage over the viaduct that spans the Ain gorges.
Near the Corveissiat retreat and cave (ENS - Listed site)
Near the Camp du Maquis
Close to the "Fontaine Noire" resurgence