The confluence of the Águeda River and Douro as seen from Barca d'Alva
|Source||Serra das Mesas|
|Length||130 km (81 mi)|
|Basin||2,537.08 km2 (980 sq mi)|
|- average||197.2 m3/s (6,964 cu ft/s)|
The Águeda is a river tributary of the Douro River, that springs from the Serra das Mesas in Spain, in the autonomous community of Castile and León. It flows 130 kilometres (81 mi) until it reaches the Douro River near Barca de Alva, Portugal. The Águeda makes a natural border between Portugal and Spain for much of its course.
- Nunes, Ádelia (2010). "Evolução Recente dos Recursos Hídricos Superficiais em 4 Cursos de Água Tributários do Rio Douro" [Recent Evolution in Water Resources in Four Water Tributary Flows of the Douro River] (PDF) (in Portuguese). Lousã, Portugal: Associação Portuguesa de Riscos, Prevenção e Segurança. pp. 29–38. Retrieved 17 November 2010.
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