Île de Sein
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The Île de Sein is a French island in the Atlantic Ocean, off Finistère, 8 kilometres from pointe du Raz (Raz meaning tidal race), from which it is separated by the Raz de Sein. Its Breton name is Enez Sun. The island, with its neighbouring islets, forms the territory of the commune of Île-de-Sein, part of the department of Finistère and the administrative region of Bretagne.
It is on the sea routes going south from the English Channel. The island was known for its wreckers, and is well known for the dangers of its waters, the Chaussée de Sein, a vast zone of reefs stretching more than thirty miles from east to west, requiring numerous lighthouses, beacons, and buoys.