Loire Valley (wine) a variety of limestone with excellent drainage that is known as tuffeau which is the same material used to build many of the famous Loire Valley Châteaux. The area around Chinon, Bourgueil and Saint-Nicolas-de-Bourgueil produces the majority of the Loire Valley's red wine based on the Cabernet franc grape—known in this areas as "Breton". The wines of the Chinon area are the softest and rich expression of the grape while the Bourgueil area produces more tannic and firm wines. The St-Nicolas-de-Bourgueil area produces the lightest colored wines. In the 19th century, the wines of the Chinon area were compared favorably
Loire Turner, Gustave Courbet, Auguste Rodin, Félix Edouard Vallotton, Jacques Villon, Jean-Max Albert, , , and Jean Chabot. Garrett, Martin, The Loire: a Cultural History. 2010, Signal Books. "Pays de la Loire, waterways guide No. 10", Editions du Breil. pp 8–27, for the navigable section (guide in English, French and German) Loire The Loire (; ; ) is the longest river in France and the 171st longest in the world. With a length of , it drains an area of , or more than a fifth of France's land area, while its average discharge is only half that of the Rhône.