Dinard is located in the Normandy-Breton Gulf. A unique geographical entity on the scale of the English Channel, the Normandy-Breton Gulf has a complex current structure due to a coastline dotted with archipelagos and islets, combined with shallow waters. The Normandy-Breton Gulf is a macrotidal system (maximum tidal range 13 m). Very strong tidal currents, result in a lack of vertical stratification. This area of the Channel is also subject to greater thermal amplitudes and turbidities than elsewhere in the Channel or southern Brittany. Two points are sampled every 15 days following SOMLIT protocols, at high tide, the Cézembre point (13 m depth, since 2014) and the Bizeux point (23 m depth, since 2012). The position of the Cézembre point is little affected by the Rance plume. dotted with archipelagos and islets, combined with shallow waters. The result is a very high tidal range (among the widest in the world, at 13 m) and very strong tidal currents, resulting in a lack of vertical stratification. This area of the Channel is also subject to greater thermal amplitudes and turbidities than elsewhere in the Channel or southern Brittany. Two points are sampled every 15 days following SOMLIT protocols, at high tide, the Cézembre point (13 m depth, since 2014) and the Bizeux point (23 m depth, since 2012). The position of the Cézembre point is little affected by the Rance plume.