A channel, flanked by two wooden piers, opens onto the outer harbor of Trouville-Deauville in the Calvados department. This outer harbor precedes the yacht basin and the wet basin, both closed by locks surmounted by movable footbridges. Extended several times in the second half of the 19th century in an attempt to avoid the silting up of the channel, the piers ending in a red light and a green light (photo) were originally made of oak. In 1868, the contractor Antoine Mauger replaced the oak with rot-proof beech for their submerged parts and red fir from Sweden and Norway for their emerged parts.