Courseulles-sur-Mer is a small harbor lying at the mouth of the Riviere Seulles. It is used by small fishing vessels and pleasure craft. The harbor consists of an avant-port leading to a wet dock and a tidal basin. The approach channel is indicated by a lighted range and dries 3.5m. Local knowledge is advised. The entrance, with a least width of 27m, lies between a jetty and a breakwater.
Training walls, which cover and are marked by beacons, extend seaward from the outer ends of the jetty and the breakwater.
The tidal basin is used by yachts and its entrance is spanned by a swing bridge. The wet dock is entered through a passage, 9.6m wide, with a gate. It has depths of 3 to 4m and can handle small vessels with drafts up to 2.5m. Entry is reported to be difficult for small craft with low height of eye because the range marks are screened by large trees.
Les Essarts de Langrune and Roches de Lion, both of which dry, form part of the coastal bank bordering the shore between
Courseulles-sur-Mer and Ouistreham, 9 miles ESE.