The Douro is one of the major rivers of the Iberian Peninsula, flowing from its source near Duruelo de la Sierra in Soria Province across northern-central Spain and Portugal to its outlet at Porto. These reaches of the Douro have a microclimate[specify] allowing for cultivation of olives, almonds, and especially grapes that are important for making the famous Port wine. The region around Pinhão and São João da Pesqueira is considered to be the centre of Port wine, with its quintas (or farms/estates) that extend the almost vertical slopes along the river valleys. Many of these quintas are owned by multinational wine companies. Recently, a prosperous tourist industry has developed based on river excursions from Porto to points along the Upper Douro valley. There are five dams on the Portuguese Douro alone functioning to make the flow of water uniform, generate hydroelectric power, and allow navigation. Ships with a maximum length of 83 metres (272 ft) and width of 11.4 metres (37 ft) can pass through five locks. The highest one on Carrapatelo dam has a maximum lift of 35 metres (115 ft). Level of Pocinho lake reaches 125 m a.s.l. The Douro railway line (in Portuguese: Linha do Douro) was completed in 1887; it connects Porto, Rio Tinto, Ermesinde, Valongo, Paredes, Penafiel, Livração, Marco de Canaveses, Régua, Tua and Pocinho. Pocinho is near the city of Foz Côa, which is close to Côa Valley Paleolithic Art site, (an Archaeological pre-historic patrimony) another UNESCO Heritage Sight
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