The Douro (UK: / /,, US: / , /,, Portuguese: [ˈdo(w)ɾu]; Spanish: Duero [ˈdweɾo]; Latin: Durius) is the highest-flow river of the Iberian Peninsula. It rises near Duruelo de la Sierra in Soria Province, central Spain, meanders south briefly then flows generally west through the north-west part of central Spain and into northern Portugal, to its mouth at Porto, the second largest city of Portugal. At its mouth it meets the Atlantic Ocean.
|Source||Picos de Urbión|
|• location||Sistema Ibérico, Duruelo de la Sierra, Soria, Castile and León, Spain|
|• elevation||2,157 m (7,077 ft)|
|Mouth||Foz do Douro|
|Atlantic Ocean, Porto, Greater Porto, Norte, Portugal|
|0 m (0 ft)|
|Length||897 km (557 mi)|
|Basin size||98,400 km2 (38,000 sq mi)|
|• average||700 m3/s (25,000 cu ft/s)|
|• maximum||17,000 m3/s (600,000 cu ft/s)|
|• average||442 m3/s (15,600 cu ft/s)|
|• left||Tera, Rituerto, Riaza, Duratón, Cega, Adaja, Tormes, Águeda, Côa, Torto, Távora, Varosa, Bestança, Paiva, Arda, Inha|
|• right||Pisuerga, Valderaduey, Esla, Sabor, Tua, Corgo, Tâmega, Sousa|
The river is notable for the scenic Douro railway line, tourism more generally and – relatedly – the creation and production of a mildly fortified wine: port, grapes, conventional wines and other agricultural produce. A small tributary of the river has the Côa Valley Paleolithic Art site which is considered important to the archaeological pre-historic patrimony, designated a UNESCO World Heritage Site.