ABSTRACT
The 483-mile (778-kilometer) long Guadiana, and the 408-mile (657-kilometer) long Guadalquivir, are the two most southerly of the four major rivers of the Iberian Peninsula to flow into the Atlantic (the other two being the Douro and the Tagus).1 Separated by the Sierra Morena, the Guadiana to the north and the Guadalquivir to the south, these two rivers flow westward, more or less parallel to each other. Both eventually curve sharply southward and continue in that direction before emptying into the Gulf of Cádiz, although the Guadiana, unlike the Guadalquivir, forms intermittent stretches of the Spanish-Portuguese border and also passes through a portion of southeastern Portugal.
