International Douro Natural Park

The Arribes, as it is called in Zamora, is a deep ravine that have been carved by the Douro. Zamora shares this space with Portugal, to whom the river makes a frontier and continues to Salamanca. In this trajectory, the Douro sometimes descends more than 400 feet, causing a spectacular canyon, a true geological throat whose slope has been exploited for the production of electrical energy. On the Portuguese side you can take a boat tour of the Douro and hear the authoritative explanation by a Portuguese biologist describing all the places you see from the boat.