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The bay of Saint-Malo has one of the largest tidal differences in Europe, with a difference of up to twelve meters between low and high tide. Three of the offshore islands Grand Bé and Petit Bé as well as the Fort National (fortress built by Vauban in 1689) can therefore be reached on foot at low tide. The Usine marémotrice de la Rance, the world's first and, until 2011, largest tidal power station, has been located in the estuary of the Rance since 1966.