Saint-Marc-sur-Couesnon (, literally Saint-Marc on Couesnon; ) is a former commune in the Ille-et-Vilaine department in Brittany in northwestern France. On 1 January 2019, it was merged into the new commune Rives-du-Couesnon. Geography Saint-Marc-sur-Couesnon is located northeast of Rennes and south of Mont Saint-Michel. The neighboring communes are Saint-Hilaire-des-Landes, Saint-Sauveur-des-Landes, La Chapelle-Saint-Aubert, Saint-Jean-sur-Couesnon, Mézières-sur-Couesnon, and Saint-Ouen-des-Alleux. Population Inhabitants of Saint-Marc-sur-Couesnon are called médardais in French. See also Communes of the Ille-et-Vilaine department References External links Geography of Brittany The page of the commune on infobretagne.com Former communes of Ille-et-Vilaine