Beaussais-sur-Mer (; ) is a commune in the department of Côtes-d'Armor, western France. The municipality was established on 1 January 2017 by merger of the former communes of Ploubalay (the seat), Plessix-Balisson and Trégon.Arrêté préfectoral 30 August 2016
Population Population data refer to the commune in its geography as of January 2025.
See also Communes of the Côtes-d'Armor department
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