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The Alqueva dam, with a 250 km² reservoir and more than 1,100 km of banks, is the largest artificial lake in Europe. It covers some Alentejo municipalities: Portel, Moura, Reguengos de Monsaraz, Mourão, Alandroal, Vidigueira and Serpa, as well as the border municipalities of Olivença, Cheles, Alconchel and Villanueva del Fresno.