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For the most part, the mountain is located in the municipality of San Lorenzo de El Escorial in the Community of Madrid, with part of its west side in the province of Ávila.
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.