Loire Valley is a UNESCO listed World heritage Site since 2000, it is located both in the administrative regions of "Pays de la Loire" and Centre-Val de Loire. Although majority of the châteaux of the Loire Valley such as Montsoreau, Angers, Saumur or Brézé in "Pays de la Loire" are located in the "Maine-et-Loire" departement, "Pays de la Loire" has numerous prominent monuments, such as the castles of Laval, and the Nantes Château des Ducs de Bretagne, the Royal Fontevraud Abbey (the widest monastic ensemble in Europe), and the old city of Le Mans. It also has many natural parks such as the Brière and the Marsh of Poitou.