La Jarosa reservoir (also known as the Jarosa swamp) is located in the Jarosa valley and it belongs to the municipality of Guadarrama, Madrid, Spain. It is the smallest reservoir of the Sierra de Guadarrama mountain range. Its total capacity reaches 7’2 cubic hectometres and its total surface area is 55 hectares. La Jarosa, does not only include the main swamp but also the meadows surrounding the body of water, several recreational zones and vast pine forest areas. The Nuestra Señora de la Jarosa hermitage and the Altar Mayor hermitage are also found in this vast terrain. La Jarosa would be included in the proposed Guadarrama National Park project, once it is finally realized. The lower zone, which contains the marsh, would belong to the "pre-park" area for consideration for the Regional Park but the highest part of La Jarosa, adjacent to the Puerto de Guadarrama, would be included in the National Park itself.
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