Castilla y León has a wine-growing area of 80,000 hectares (6% of the national total). It is the fourth Community in area dedicated to grape cultivation and is home to more than 600 wineries that are growing thanks to the dedication of 18,500 producers for unique wines. Throughout the territory of the Autonomous Community there are 17 denominations of origin, of which three are vino de pago, and a figure of quality as local wine for the entire territory, the geographical mention (I.G.P.) of Vino de la Tierra de Castilla y León. The surface of the Community is structured as a large agricultural space dotted with vineyards, mainly around the basin of its main river, the Duero, which gives life to some of the most famous wines in the world. The oldest vestiges of vine cultivation and winemaking are linked to the pre-Roman world, specifically to the Celtic cultures of the Duero basin; as evidenced by the trousseau found in the Pintia vacceo site (Valladolid province).