Roll out of Grignols and the ride opens through the Landes de Gascogne nature reserve before you follow the Ciron river along its course. Three castles line the way: the medieval Château de La Trave, then Roquetaillade, then the Château du Mirail. It's 81.4 km of paved riding with 417 m of climbing, and the loop brings you back to where you started.
