Reservoir of la Cuerda del Pozo Nature · Cidones, Frentes, Soria The Cuerda del Pozo reservoir holds back the waters of the Duero at its source, at the foot of the Sierra de Cabrejas and the peaks of Urbión, and occupies part of the territory of Cidones, in the province of Soria. Its construction was approved in 1923 and finished in 1941, with Republican political prisoners as the workforce after the Civil War; it is also known as the La Muedra reservoir, after the name of the flooded village whose church tower can still be seen emerging in the middle of the reservoir. With a dam 36 metres high and a capacity of 249 million cubic metres, it ranks among the six largest reservoirs in the country within the Duero basin, and has become the province's great expanse of open water, with beaches such as Pita, where windsurfing, sailing and fishing are practised. Photo: Miguel Ángel García. from Ólvega., España (CC BY 2.0) What to see and do in Cidones