Sancerre (wine) up the eastern most extension of the Loire Valley. The area is more than 300 miles (483 kilometers) from the Atlantic Coast and the Loire region of Muscadet, and is actually closer to the Champagne wine region than it is to the Middle Loire city of Tours and the Vouvray and Chinon AOCs. The distance from the Atlantic gives this region more of a continental climate than typical of the rest of the Loire with short, hot summers and long, cold winters that may extend the threat of frost damage into early spring. The most dominating geographical influence of Sancerre
Loire Nevers, La Charité-sur-Loire, Cosne-Cours-sur-Loire, Cher: Sancerre, Loiret: Briare, Gien, Orléans, Loir-et-Cher: Blois, Indre-et-Loire: Amboise, Tours, Maine-et-Loire: Montsoreau, Saumur, Loire-Atlantique: Ancenis, Nantes, Saint-Nazaire. The Loire Valley in the Loire river basin, is a stretch in the western reach of the river starting with Orléans and terminating at Nantes, short of the Loire estuary and the Atlantic Ocean. The tidal stretch of the river extends to a length of and a width of , which has oil refineries, the port of Saint-Nazaire and of wetland whose formation is dated to 7500 BC (caused by inundation by sea waters on the northern bank