This is a central region of France, but despite the name, it is actually located northwest of the geographic centre of the country. Actually, this name is a result of a complex history and the fact that this area is a unification of numerous small areas with distinct names and history, and a try not to favor one of them. The main feature of the region is the Loire Valley, almost as much as the region Pays de Loire. The listed underground sights are connected with the artificial cellars and cave houses along the Loire river, which are former limestone quarries. The rocks were used to build all kinds of buildings, especially the famous châteaux of the Loire. Later the huge underground spaces were used for living, storing wine, growing fungi, and as hideouts. Today they are still used for restaurants and hotels. For other sights of this kind, see the list on Pays de la Loire.