The springs of the Valle del Cuco Nature · Corrales de Duero, Campo de Peñafiel, Valladolid Image of Corrales de Duero, not of the place itself. The municipality preserves numerous springs spread across the valley, which for centuries supplied vegetable gardens and livestock. A circular route of thirteen kilometres links them through slopes of holm oak and cereal. Photo: Juan Pablo Zumel Arranz (CC BY-SA 3.0) What to see and do in Corrales de Duero