Castles from the Epte to La Roche-Guyon

The ride

Roll out of Gasny and follow the Epte out toward the Vexin Français nature reserve, then on past the Coteaux de la Seine reserve and the castle at La Roche Guyon. The route swings by the forest of Île du Talus and the Château des Tourelles before a last look at Le Vieux-Moulin watermill, then it's back to Gasny. It's 74.8 km with 571 m of climbing, all on paved surface.