A short but exceptional walk in the Ardenne et Gaume nature reserve with its magnificent geological rock formation Roche à l'Appel. Hikers must have a good condition to cope with the winding, sometimes quite steep paths. The circuit on and around the Roche à l'Appel is very special. Geologists from all over the world come here to amaze themselves at this rock mass which consists mainly of pudding stone.

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