The infamous strait Raz de Sein, stretching between Pointe-du-Raz and the island Ile-de-Sein.
Here seen from the former and westwards to the latter. As clearly shown, rapid tidal currents w/ speeds up to 6 knots rips these waters,
which along with the many rocks and reefs makes it downright dangerous for any naval traffic. Hence the many lighthouses, which are:
in the foreground the yellow La Plate and La Vieille, then Enez Sun on Ile-de-Sein, and on the far horizon the standalone tower of Ar Men.