MontreuillonMontreuillon is a commune in the Nièvre department in central France.WWW montreuillon.euDemographicsOn 1 January 2019, the estimated population was 259.EurozoneMontreuillon was the official centre of the Eurozone between 2001 and 2007.Canal du NivernaisIt is the site of an impressive aqueduct over which runs the feeder canal linking the Pannecière reservoir with the Canal du Nivernais.