The Île de Sein is a French island in the Atlantic Ocean, off Finistère, 8 kilometres from the Pointe du Raz, from which it is separated by the Raz de Sein. The island, with its neighbouring islets, forms the commune of Île-de-Sein in the Finistère department of Brittany in north-western France.

• Telefoon +(0)2 98 70 70 70
• E-mail -
• Adress Quai des Paimpolais, 29990 Pont-Croix
• Website http://www.mairie-iledesein.com/