Rondje Château-Vieux en Réserve naturelle du Marais d'Orx

The ride

Roll out of Bayonne for 68.6 km that loop back to where you began. Pass the Échauguette viewpoint, follow La Nive, and pedal by the Château-Vieux fort before the Marais d'Orx nature reserve opens up. Then it's on past the Ardanabie and L'Adour rivers to the Château-Neuf castle, with 308 m of climbing spread along the way. Almost all of it is paved, so the wheels keep turning from start to finish.