Ribera del Duero

The banks of the Río Duero are lined with poignant ruined castles amid pretty old towns such as El Burgo de Osma and Lerma. The river cuts through two dramatic networks of canyons, the Cañón del Río Lobos and the Hoz del Duratón. Add to this the Ribera del Duero wine-producing region, one of Spain's most respected, and you could easily spend the best part of a week exploring the area.