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The San Juan reservoir (Embalse de San Juan, in Spanish) is located along the Alberche river between the municipalities of San Martín de Valdeiglesias, El Tiemblo, Cebreros and Pelayos de la Presa, at the south-eastern end of the Autonomous Community of Madrid, bordering on the province of Ávila.
Map of San Juan Reservoir, Spain
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.
One of its main functions is 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.