The Baie de Douarnenez is a bay in Finistère, France, between the Crozon peninsula to the north and the cap Sizun to the south. It is formed of a vast semi-circular basin over 16 km wide and 20 km from its entrance to the opposite shore. Although half-closed-off to the west by cap de la Chèvre, it opens out again to a width of 9 km on the side of the mer d'Iroise. To the south-east is to be found the sardine port of Douarnenez which gives the bay its name, the only settlement of importance on the banks of the bay.
Latitude: 48° 09' 60.00" N
Longitude: -4° 25' 59.99" W