From the Saint-Nazaire submarine base, you'll cycle through the town centre, winding your way between the Bois Joalland and Guindreff ponds towards the Immaculée district.
You'll then have to pedal through the Brais area to reach the town centre of Saint-André-des-Eaux. Just a few more minutes and you'll be amazed by the Chaussée Neuve harbour, which invites you to take a ride on a barge, the famous boat typical of the Brière region.