 wine region stretches about 115km along "the banks of the river Duero" touching the provinces of Soria, Burgos, Segovia and Valladolid.It is bounded on the north by Arlanza "comarca", south by the Province of Segovia, on the east by the province of Valladolid and on the west by the Sierra de la Demanda "comarca" and the province of Soria.There are about 68 towns and villages (mostly villages) in the Ribera del Duero comarca.