The Arribes del Duero is a stunning gorge separating Spain and Portugal. The gorge cuts through granite rock and runs some eighty kilometres, of which fifty run alongside the Portuguese border, with cliffs rising to more than 200 metres in places. The cliffs support superb birdlife including griffon vultures, golden eagles and black storks are overs. Boat trips starting at Fronteira de Zamora can be arranged. There are also several hydroelectricity dams along the river. Spanish philosopher Miguel de Unamuno described Arribes del Duero as “One of the most beautiful and impressive landscapes in Spain.”
Arribes del Duero is also a natural park, covering 106.105 ha. Portuguese natural park lies alongside Arribes del Duero. Taking the two parks together, Douro Internacional covers 191.255 ha making it one of the largest protected areas in Europe.