Stock Photo - The El Atazar reservoir dam is located in the Sierra de Ayllón, in the Community of Madrid, Spain. It is a vital source of water for the city of Madrid and was built in the 1970s as part of the Lozoya River reservoir system. The El Atazar dam is about 134 meters high and can store around 425 million cubic meters of water. Its main function is to regulate the supply of drinking water for Madrid and control flooding in the area. In addition to being important for water supply, the reservoir also offers recreational activities such as fishing and water sports. The scenery around the swamp is beautiful, with mountains and forests providing a natural setting to enjoy outdoor activities.