Roman ruins close to the Guadiana river before the construction of the Alqueva Dam Now this area is submerged by a 250 sq km lak

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Photo credit: © Luso B&W / Alamy / Afripics
License: Licensed
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Keywords: agriculture, alentejo, alqueva, artificial, attraction, black, civil, desert, draught, engineering, government, hydraulic, irrigation, lake, landscape, money, necessity, portugal, public, rio, river, tourism, water