 The territory of the commune is now part of the wild coast of Guérande Peninsula with rocky cliffs, sandy beaches along the Atlantic Ocean, and an extensive salt marshes to the northeast and east.The town lies between the Bay of Biscay and its salt marshes and is a very Breton town of whitewashed granite houses.In 945, Alan II, Duke of Brittany, founded a priory in Batz-sur-Mer, dedicated to St Winwaloe.