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The dam wall of the Lai da Sontga Maria artificial lake, pictured Monday, July 4, 2011 near Medel in the Canton of Grisons, Switzerland. The reservoir has a surface area of 1.77 square km. The arch dam Santa Maria was completed in 1968. In the lake, there is an anchor pylon of Lukmanier Powerline. (KEYSTONE/Alessandro Della Bella)