Guadiana

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Guadiana river

Guadiana basin

The Guadiana near Serpa, Portugal.

Guadiana mouth, Portugal on the left, Spain on the right

Guadiana (Arabic: Wadi Ana‎, Latin: Anas, Spanish: Guadiana, Portuguese: Guadiana, pron. IPA: [gwɐdi'ɐnɐ], or Odiana) is one of the major rivers of Spain and Portugal. It forms part of the border between the two countries, separating Extremadura and Andalucia (Spain) from Alentejo and Algarve (Portugal).

It is 778 kilometers long and drains an area of about 67,000 square kilometers. It flows into the Gulf of Cadiz, part of the Atlantic Ocean, between Vila Real de Santo António (Portugal) and Ayamonte (Spain).

Badajoz, Spain, is the largest city on the river. The largest portuguese citiy along the Guadiana is Vila Real de Santo António, 2 km from its mouth. There are nearly two thousand dams on the river, the largest of which is the Alqueva dam in Portuguese territory.