Pontorson is 9 km from Mont Saint-Michel, 22 km from Avranches and 45 km from Granville.
Located in the middle of the bay of Mont Saint-Michel, Pontorson is a city crossing the Couesnon (one of the three rivers of the bay of Mont-Saint-Michel)
Pontorson is crossed by the Couesnon and nearly 10 km of marsh area to the south and 4,800 hectares of polders.
Pontorson and township enjoying a temperate oceanic climate and are protected by the bay of Mont Saint-Michel.
Its surrounding communities are: Huisnes-sur-Mer, Tanis, Macey, Vessey, Aucey-la-Plaine, Sougéal, Saint-Georges-de-Gréhaigne, Beauvoir, Mont Saint-Michel.
The city was founded in the twelfth century on a vow of William the Conqueror. the important stronghold near Brittany, Pontorson fortress was razed in 1623 by order of Louis XIII. Some vestiges remain from this period as the Notre Dame, the hotel Guiscard of Ménardière or former Hotel Dieu St. Anthony of Charity.
In 1973, the town merged with Ardevon, Beauvoir, Boucey, Cormeray, Curey, Moidrey and The Pas, who kept associated municipalities status. Beauvoir has regained its independence in 1989. Located 9 km from Mont-Saint-Michel, Pontorson is the heart of the Bay of Mont Saint-Michel, on the banks of the Couesnon, the heart of future major projects that will restore her to Mt. insularity.