Dinan is a new French commune, created on January 1, 2018, resulting from the merger of the communes of Dinan and Léhon and a sub-prefecture located in the department of Côtes-d'Armor in the Brittany region. It is a town in Poudouvre, a traditional country in northern Upper Brittany.The town of Dinan is fortified by a belt of ramparts and was defended by an imposing castle. A strategic point for traffic between Normandy and the northern coast of Brittany, Dinan is built mainly on a hill. The city dominates by 75 m the Rance which flows northwards to flow into the Channel between Saint-Malo and Dinard. Dinan long proposed the northernmost bridge to cross the Rance and its wide estuary.Dinan is the seat of Dinan Agglomération, a conurbation community created in 2017.Its 14,682 inhabitants are Dinannais.