Lakes around Arroyomolinos are primarily characterized by streams and riparian vegetation within the Regional Park of the Middle Course of the Guadarrama River. While the municipality itself does not feature large natural lakes, its natural environment includes significant water-related features like the Arroyo de los Combos. Nearby, the Parque Nelson Mandela in Móstoles offers artificial lakes for recreation. This area provides opportunities to explore diverse ecosystems and historical water management.
Last updated: August 28, 2026
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The Cornalvo Dam is an impressive Roman engineering work located about 15 km from Mérida. Built in the 1st century AD, this dam is still in use today and is part of the Cornalvo Natural Park. The reservoir is an ideal place to enjoy nature and explore Roman history.
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Built around 130 AD, this dam was used to supply water to the ancient Roman city of Augusta Emerita. The reservoir and its surroundings were declared a natural park in 2004, making it an ideal destination for nature and history lovers.
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A place with very nice views of Sierra Bermeja. It has a circular path of about 5/6km that is very cyclable, with an initial part (depending on which direction you go) that is a bit steep.
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In spring the number of birds that can be observed from its viewpoints is spectacular and how beautiful the site can be.
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In spring the number of birds that can be observed from its viewpoints is spectacular, without counting the herds of cattle that come to drink and frolic on the shore of the reservoir.
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Reservoir that is located within the Cornalvo Natural Park and that represents one of the water areas that exist in this protected area. Very beautiful in leafy and wet seasons!
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One of the attractions of the Cornalvo Natural Park is the homonymous reservoir that is very close to the town on the A-5 highway and is easily reached from Trujillo or San Pedro de Mérida. A place that deserves to visit and to which you can turn completely around a picturesque path.
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While Arroyomolinos does not feature large natural lakes, you can explore the Parque Fluvial de los Arroyos. This local green space covers 62.3 acres and includes a lake, walking paths, and sports facilities, offering a pleasant recreational area with a water body for residents.
Yes, the Cornalvo Dam is a notable historical site. Built around 130 AD, this man-made monument was crucial for supplying water to the ancient Roman city of Augusta Emerita. Its surroundings were declared a natural park in 2004, making it a destination for both nature and history enthusiasts.
For swimming and water sports, the San Juan Reservoir, often called "Madrid's beach," is an excellent option. Located about 50 km from the capital, it's one of the few areas in the Community of Madrid suitable for swimming, boasting 14 km of designated "beaches" and facilities for various water activities.
Absolutely. Several spots are great for families. The Riosequillo Natural Pools in Buitrago de Lozoya feature what is listed as the largest natural pool in Spain, complete with a beach bar, sports courts, and a children's area. Las Presillas in Rascafría also offers three natural pools, grassy areas for picnics, and amenities, all with stunning mountain views.
The Las Muelas Reservoir is highly recommended for birdwatching. Especially in spring, you can observe a spectacular number of birds from its viewpoints. It's also common to see herds of cattle grazing near the shore, adding to the natural scenery.
Beyond enjoying the lakes themselves, the surrounding areas offer various outdoor activities. You can find numerous MTB trails, running routes, and cycling paths. For example, the Cornalvo Natural Park, home to the Cornalvo Dam and Reservoir, has a popular circular route suitable for cycling and hiking.
Yes, there are hiking opportunities. The Pantano de Cornalvo Circular Route is a popular trail of about 5-6 km that offers very nice views and is largely cyclable. Additionally, the area around Las Berceas in Cercedilla is known for its proximity to various hiking trails.
The best time to visit often depends on your activity. For swimming and enjoying the natural pools like Riosequillo, the summer months (mid-June to end of August) are ideal when they are open and fully equipped. For birdwatching at Las Muelas Reservoir, spring is spectacular. The Cornalvo Reservoir is particularly beautiful in leafy and wet seasons.
Many natural swimming areas are well-equipped. For instance, Riosequillo Natural Pools offer a beach bar, sports courts, and a children's area. Las Presillas provides toilets and kiosks, while Las Berceas includes changing rooms, showers, and a beach bar.
Some of the more popular destinations are accessible by public transport. For example, the San Juan Reservoir can be reached by bus from Príncipe Pío in Madrid. For other locations, especially those further into natural parks, a private vehicle might be more convenient, though some may offer parking for a fee.
The lakes and reservoirs, particularly those within natural parks like Cornalvo, are rich in wildlife. Las Muelas Reservoir is known for its diverse bird population, especially in spring. The natural environments also support various riparian species and, in some areas, grazing cattle.


Still not found your perfect lake around Arroyomolinos? Check out the guides of these regions to see even more beautiful places.