Historic hilltop walled medieval village of Mertola with castle, on the banks of the river Rio Guadiana, Baixo Alentejo, Portugal, Europe

Barragem do Alqueva, Rio Guadiana river, Alqueva dam hydroelectric power, Moura, Portugal, Europe

Historic hilltop walled medieval village of Mertola with castle, on the banks of the river Rio Guadiana, Baixo Alentejo, Portugal, Europe

Barragem do Alqueva, Rio Guadiana river, Alqueva dam hydroelectric power, Moura, Portugal, Europe

Barragem do Alqueva, Rio Guadiana river, Alqueva dam hydroelectric power, Moura, Portugal, Europe

Barragem do Alqueva dam, part of the multipurpose water management project on the Rio Guadiana river, hydro-electricity generation electricity power lines, Moura, Portugal, Europe

The 13th century castle and walled city, with a strong Islamic history, overlooking the Guadiana River, Mertola, Alentejo, Portugal, Europe

View over whitewashed village of Alcoutim on Rio Guadiana river, Alcoutim, Algarve, Portugal, Europe

Sanlucar de Guadiana village seen from the Portuguese city Alcoutim, Spain, Europe

Windmill above village and Rio Guadiana river with view to Portugal, Sanlucar de Guadiana, Huelva Province, Andalucia, Spain, Europe

Aerial view of the Guadiana river and its bridges, Badajoz, Extremadura, Spain

Sailing boats on the river Guadiana, boarder to Andalusia, Spain, Alcoutim, Algarve, Portugal

View from castle across Rio Guadiana towards Spain, Alcoutim, Algarve, Portugal

Sailing boats on the river Guadiana, boarder to Andalusia, Spain, Alcoutim, Algarve, Portugal

Ferry on the Rio Guadiana border river between Portugal, Vila Real de Santo Antonio, Algarve, and Spain, Ayamonte, Andalusia, Europe

Lusitania Bridge over Guadiana River, night shot, Merida, Badajoz province, Ruta de la Plata, Spain, Europe

Lusitania Bridge over Guadiana River, Merida, Badajoz province, Ruta de la Plata, Spain, Europe

Lusitania Bridge over Guadiana River, night shot, Merida, Badajoz province, Ruta de la Plata, Spain, Europe

Lusitania Bridge over Guadiana River, night shot, Merida, Badajoz province, Ruta de la Plata, Spain, Europe

Lusitania Bridge over Guadiana River, night shot, Merida, Badajoz province, Ruta de la Plata, Spain, Europe

Lusitania Bridge over Guadiana River, Merida, Badajoz province, Ruta de la Plata, Spain, Europe

Black headed gull (Chroicocephalus ridibundus) bathing at sunrise, Rio Guadiana, Fernan Caballero, Spain

Night heron (Nycticorax nycticorax) fishing a catfish in the Guadiana river. Guadiana river, Daimiel Ciudad Real, Spain