The heights of Robleñada and Cuchillejo Nature · Castrillo de Duero, Campo de Peñafiel, Valladolid Image of Castrillo de Duero, not of the place itself. At 931 and 928 metres they are the highest points of the province of Valladolid. A path of 8.72 kilometres runs over them covering a height difference that goes from 638 to 921 metres among vineyards and moorland. Photo: Ydelpico (CC BY-SA 3.0) What to see and do in Castrillo de Duero