Roll out of Avanton on a ride that links four castles with three rivers. You pass the Château d'Avanton and the Château des Aubiers before meeting the L'Envigne, then continue past the Château de Clairvaux and the Château de la Tour-de-Naintré. The Le Clain and La Vienne rivers round out the loop before you head back to Avanton. It's 73.6 km, all of it paved, with 472 m of climbing along the way.
