Port Ouest is protected by two angled jetties which form an entrance, 450m wide. It consists of Avant-port, 1 mile long, and Bassin de l’Atlantique, a large tidal basin.
The entrance channel, leading SE into Avant-port from Passe de l’Ouest, is dredged to a depth of 20m. The dredged depth reduces to 19m within Avant-port and to 17m within Bassin de l’Atlantique.
Canal des Dunes, with a depth of 3.5m, connects Bassin de Mardyck in Port Este to Darse de la Manche in Port Ouest. It is mostly used by small craft and barges.
Access to the "Port Ouest" (port west) not allowed to pleasure craft. Reach port east.