Loire Valley (wine) weather sometimes requiring that the must be heated in order to complete fermentation fully. The Loire Valley is often divided into three sections. The Upper Loire includes the Sauvignon blanc dominated areas of Sancerre and Pouilly-Fumé. The Middle Loire is dominated by more Chenin blanc and Cabernet franc wines found in the regions around Touraine, Saumur, Chinon and Vouvray. The Lower Loire that leads to the mouth of the river's entrance to the Atlantic goes through the Muscadet region which is dominated by wines of the Melon de Bourgogne grape. Spread out across the Loire Valley are 87 appellation under
Châteaux of the Loire Valley each year. Though there is no universally accepted definition for the designation, the main criterion is that the château must be situated close to the Loire or one of its tributaries (such as the Maine, Cher, Indre, Creuse or Loir). Châteaux further upstream than Gien are generally not included, with the possible exception of the Bastie d'Urfé for its historical significance. Châteaux of the Loire Valley The Châteaux of the Loire Valley (French: "Châteaux de la Loire") are part of the architectural heritage of the historic towns of Amboise, Angers, Blois, Chinon, Montsoreau, Nantes, Orléans, Saumur, and Tours along the