Saint Nazaire is an important commercial port and shipbuilding center. It lies on the N bank of La Loire, 5 miles within the entrance. With an annual external traffic volume in the order of 30 million tonnes, Nantes - Saint Nazaire is the leading port on France’s Atlantic Seaboard. The main harbor, which was a former German submarine base, consists of an outer tidal basin and two inner wet dock basins entered through locks.
Winds predominate from the SW and W for a good part of the year. In summer winds from the N are fairly common.
Tides at Saint Nazaire rise about 5.5m
at springs and 4.2m at neaps.