Loire Valley (wine) by the Bretons of the area's wine stocks. By the 11th century the wines of Sancerre had a reputation across Europe for their high quality. In the High Middle Ages, the wines of the Loire Valley were the most esteemed wines in England and France, even more prized than those from Bordeaux. The Loire river has a significant effect on the mesoclimate of the region, adding the necessary extra few degrees of temperature that allows grapes to grow when the areas to the north and south of the Loire Valley have shown to be unfavorable to viticulture. In addition to
Pays de la Loire la Loire" ("of the Loire"). 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. In