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The Raz de Sein is a stretch of water located between the Isle of Sein and the Pointe du Raz in Finistère in the Brittany region of France.
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Map of Raz de Sein, France
This tidal water is an essential passage for vessels wishing to pass between the Atlantic and the English Channel, because further west at high tide the Isle of Sein and its embankment stretch for more than thirty miles.
This is a very dangerous zone for navigation due to the violent sea currents from the tides (up to six knots during the spring tides). The current causes the sea to rise quickly, and it is recommended that heavy vessels should only attempt to cross this strait at still water during calmer conditions.
The Raz de Sein is bounded by the La Vieille and Petite Vieille lighthouses and by the shoreline of the île de Sein.
Maritime disasters
During the French Revolutionary and Napoleonic Wars, the British navy blockaded the strategically important port of Brest. French ships leaving Brest had several options, and the Raz de Sein was among them, so it was the scene of several important actions. Notably, during the Expédition d'Irlande, on 16 December 1796 the Séduisant was lost as the French invasion fleet transited the Raz de Sein at night in stormy weather in an attempt to avoid the British blockade.
On May 26, 2006, Édouard Michelin died while fishing for sea bass on his ship Liberté. The skipper of the boat, Guillaume Normant, also lost his life in the accident. The boat was found two days later with no apparent damage, 70 meters deep and roughly 15 km from the Île de Sein.