Saint-LauneucSaint-Launeuc is a former commune in the Côtes-d'Armor department of Brittany in northwestern France. On 1 January 2025, it was merged into the commune of Merdrignac.GeographyThe river Meu forms the commune's southern border. The Rance forms the commune's northern border.PopulationInhabitants of Saint-Launeuc are called launeucois in French.