The Portuguese wine-growing region is named after the approximately 900 km long river, on whose very steep slopes with extreme gradients the vineyards are located. This river rises in the Spanish province of Soria in the Castilla y León region, flows through northern Spain under the name "Duero" and then through northern Portugal as "Douro" until it finally flows into the Atlantic Ocean at the city of Porto. The river forms the Portuguese-Spanish border for over 100 kilometres, after which the port wine region extends into Portugal for just as long. The Douro has cut a deep valley into the slate-granite mountains, on the slopes of which the vines for the port wine grow.
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