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Also see article entitled Duero . ]] The Douro ( of Spain and Portugal , flowing from its source near Soria across central Spain and Portugal to its outlet at Oporto . Its total length is 897 Km , of which only sections on the Portuguese river are navigable by light rivercraft. Its name must have come from the Celtic tribes that inhabited the area before Roman times: ''dwr'' is a Celtic word meaning "water". In its Spanish section the Douro crosses the great Castilian '' Meseta '' passing through Soria , Almazán , Aranda De Duero , Tordesillas , and Zamora . There are few large tributaries of the Douro before it enters Portuguese territory. The most important are the Pisuerga , passing through Valladolid , and the Esla , which passes through Benavente . This region, for the most part, is one of semi-arid plains planted with Wheat and in some places, especially near Aranda de Duero, in Wine Grape s. Sheep rearing is also still important. Once the Douro enters Portugal major population centers practically disappear. The Portuguese Douro is a region of narrow Canyon s, making it a historical barrier for invaders from the north and a linguistic dividing line. This isolated area has now protected status. Until recently, tiny villages along this reach of the Douro were relatively isolated from the rest of the country. Except for Oporto, at the river mouth, the only population centers of any note are Foz De Tua , Pinhão and Peso Da Régua . Tributaries are small and flow into canyons to enter the larger river. The most important are the Coa , the Tua , the Tâmega , the Balsemão , and the Sousa . None of these small, fast flowing rivers are navigable. These upper reaches of the Douro have a Microclimate allowing for cultivation of Olive s, Almond s, and especially Grape s important for making the famous Port Wine . The region around Pinhão and São João Da Pesqueira is considered to be the center of Port wine with its picturesque ''quintas'' or farms clinging on to almost vertical slopes dropping down to the river. Many of these quintas are owned by multinational beverage companies and are worth a visit. Traditionally, the wine was taken down river in flat-bottom boats called ''rabelos'' to be stored in barrels in cellars in Vila Nova De Gaia , just across the river from Oporto. Quite often these boats were lost in accidents, and seasonal fluctuations in the river made transport precarious. In the 1980s Dam s were built along the river ending this river traffic. There are nine dams on the Portuguese Douro alone making the flow of water uniform and generating Hydroelectric Power . Now Port wine is transported in tanker trucks. Recently, a prosperous Tourist industry has developed based on river excursions from Oporto to points along the upper Douro. Boats pass through the dams by way of Locks . ''Major riverside towns:'' Soria , Almazán , Aranda De Duero , Tordesillas , Zamora (Spain); Oporto (Portugal) |