Riosequillo Reservoir, embalse en el río Lozoya, península ibérica
The Riosequillo Reservoir is a large water storage area in the Sierra de Guadarrama mountains near Madrid, formed by damming the Lozoya River. The concrete dam stretches over one kilometer long and rises more than 50 meters high, with the stored water spreading across several kilometers through the valley.
Built in 1956 and opened in 1958, the reservoir was created to supply water to the rapidly growing city of Madrid after the civil war. The dam construction was a major infrastructure project of that era that provided reliable water supply to the region and eventually also generated electricity.
The name comes from the small Río Sequillo stream that feeds the reservoir. Today it serves as a gathering place where locals come to swim, picnic, and enjoy outdoor activities on weekends and holidays.
The site is easy to reach by car or local buses from Madrid, with ample parking available nearby. Well-marked paths circle the water, and the recreation area with pools, picnic zones, and play areas accommodates visitors of all ages year-round.
The natural swimming pool here is the largest of its kind in all of Spain and can hold around 2000 people at once. Additionally, there is a botanical garden with over 200 different plant species that visitors can explore while walking the trails.
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