The San Juan reservoir (''Embalse de San Juan'', in Spanish) is located along the

Alberche The Alberche is a river in the provinces of Ávila, Madrid and Toledo, central Spain. It begins its course at 1,800 m in Fuente Alberche, San Martín de la Vega del Alberche municipal term, Ávila Province. It forms the natural division between ...

river between the municipalities of

San Martín de Valdeiglesias San Martín de Valdeiglesias is a town of Comunidad de Madrid with a population is 8,190 people. History The Castle of Coracera was built in the fifteenth century. Geography San Martín is near to Cadalso de los Vidrios, Pelayos de la Pres ...

El Tiemblo El Tiemblo is a municipality located in the province of Ávila, Castile and León, Spain. According to the 2012 census (INE), the municipality has a population of 4,461 inhabitants, and covers an area of about 75 km2. Location El Tiemblo ...

Cebreros Cebreros () is a Municipalities in Spain, municipality of Spain, located in the province of Ávila, part of the autonomous community of Castile and León. As of 2018 it had a population of 3,056. The municipality covers an area of 137.47 km2. ...

and

Pelayos de la Presa Pelayos de la Presa () is a municipality in the Community of Madrid, Spain. It covers an area of 7.58 km2. , it has a population of 2,475. It is located in the southwest of the region, near the San Juan Reservoir (retaining the waters of the ...

, at the south-eastern end of the Autonomous Community of Madrid, bordering on the province of

Ávila Ávila (, , ) is a city of Spain located in the autonomous community of Castile and León. It is the capital and most populated municipality of the Province of Ávila. It lies on the right bank of the Adaja river. Located more than 1,130 m abov ...

. The reservoir was built in 1955 and has a capacity of 138 km3, covers a surface area of 650 hectares, and is managed by the ''Confederación Hidrográfica del Tajo''. Since the 1990s one of its main functions has been to deliver water to the city of Toledo along the canal known as the ''Trasvase Picadas-Toledo''. It also generates electricity and supplies water to the south-eastern part of the Autonomous Community of Madrid. In addition, recreational use (bathing and sailing) is permitted and is a popular destination for the inhabitants of Madrid.PANTANO DE SAN JUAN - Parque Natural - España Fascinante
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References

{{Alberche dams Reservoirs in the Community of Madrid Water supply of Toledo, Spain Alberche