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The Guadalquivir river basin is in the south of Spain, with a surface area of 57,527 km², including parts of four regions: Andalusia, Castilla-La Mancha, Extremadura and Murcia. Rains in the area are often torrential and fall on lands recurrently affected by long periods of drought and high temperatures, and a marked susceptibility to erosion. In the basin, there are nu ...