The Guadiana, or Odiana, is an international river located on the along Portuguese-Spanish border, forming part of the border of the European States, separating Extremadura and Andalucia (Spain) from Alentejo and Algarve (Portugal).
The Guadiana, 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).