Avranches is a commune in the Manche department in the Basse-Normandie region in north-western France. It is a sub-prefecture of the department. The inhabitants are called Avranchinais. In 933 Avranches and its territory, the Avranchin, were ceded to the Normans.
The town was founded on high ground overlooking the dunes and coastal marshes along the bay forming the corner between the peninsulas of the Cotentin and Brittany. From Avranches, it is possible to see the Mont Saint Michel, which was founded by Saint Aubert, Bishop of Avranches in the 8th century.