Saint-Valery-sur-Somme, a small harbor, is situated on the S shore of the bay, 2.5 miles ESE of Pointe du Hourdel. It is used by small commercial vessels and recreational craft.
The entrance channel leading to the harbor dries 5.8m and is marked by buoys and beacons. The fairway stays dry until the incoming tide reaches it, about 2 hours before HW.
The harbor is about 1,700m long and 60m wide. It is bordered on the E side by a breakwater and on the W side by an embankment and a quay. The bottom alongside the quay consists of mud and dries 5m. The tides rise about 10.1m at springs and 8.1m at neaps. Small vessels up to 50m in length and 3.6m draft can be handled at HWS.