This route takes in the vast landscapes of dried marshland, land that has been dyked and reclaimed from the sea. Here, the marshes roll out their uniform, bare horizon, a landscape criss-crossed by cereal crops. You'll reach the seafront, where on a clear day you'll be able to see the island of Ré. The rest of the route takes you to l'Aiguillon-sur-mer, its port and oyster beds. If you walk along the beach at low tide, you'll notice the "bouchots", oak stakes used to raise the bouchot mussel.