Roll out of Pontchâteau and follow the Le Brivet river out of town. The route then runs through the Parc naturel régional de Brière, a nature reserve that fills the middle of the ride. Further on you cross the La Vilaine and L'Isac rivers before the road brings you back to Pontchâteau. It's 74.7 km with 350 m of climbing, all on paved surface.
