This very sporty circuit offers beautiful contrasts of landscapes between the Picardy plain and the end of the Laonnois mountains. In its second part, the countryside becomes hilly, charming around Courtrizy. Leaning against the foothills of the Chemin des Dames, the mounds of Mont Héraut and Saint-Erme increase the difficulty. A second departure is possible from the church of Montaigu: reach point 6.