Belle-Île or Belle-Île-en-Mer (ar Gerveur in Modern Breton; Guedel in Old Breton) is a French island off the coast of Brittany in the département of Morbihan, and the largest of Brittany's islands. It is 14 km from the Quiberon peninsula. Administratively, the island forms a canton: the canton of Belle-Île. It is divided into four communes: Bangor Le Palais Locmaria Sauzon