There are three regional appellations of Muscadet sur lie that undergo maturing on lees: Muscadet Sèvre et Maine, Muscadet Côtes de Grandlieu, and Muscadet Coteaux de la Loire. Together these three appellations form the core of Muscadet wines.
Matured for at least six months on lees, Muscadet Sèvre et Maine wines perfectly reveal their invaluable terroirs. They are structured wines with a good deal of minerality; these characteristics are complemented by fullness, depth and aromas of warm or damp pebbles, depending on the soils on which each wine is grown. The best vintages offer excellent aging potential.
Recognized in 1936, Muscadet Sèvre et Maine is one of France’s oldest AOCs. It is the largest regional appellation of the Nantes wine region in terms of surface area and production volume, with 6400 hectares (15,808 acres) and 425 winegrowers. Located between the Sèvre and the Maine, the two last tributaries of the Loire before it reaches the ocean. Its soils—composed of gneiss, orthogneiss, granite, schist and gabbro—offer great diversity.
Source : https://www.muscadet.fr/en/