It is located in the southwest of the region, near the San Juan Reservoir (retaining the waters of the Alberche), the source the municipal water supplies come from.[3] The reservoir is shared between Pelayos de la Presa, Navas del Rey and San Martín de Valdeiglesias, with Pelayos de la Presa having jurisdiction over "El Muro" area.[4] As it is the only reservoir in the region declared as swimming area, it attracts tourism.
The Monastery of Santa María de Valdeiglesias [es], with its origins dating back to the 12th century, cistercian-style, is located in the municipality.[5][4] It is located at 570 m over sea level.[6]
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