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The El Atazar Dam is an arch dam near Madrid, Spain, on the Lozoya River, close to where the Lozoya joins the Jarama. Built in a narrow gorge between 1968 and 1972, the dam is 440 feet (134 m) high and 171.6 feet (52.3 m) wide at the foundation. It has a reservoir capacity of 344,000 acre-feet (424,000,000 m3).Photograph: Carlos Delgado