Bridge (early 11th century) over the Arga river at Puente La Reina
|- location||near Esteríbar|
|- location||Aragón River|
|Length||145 km (90 mi)|
|- average||59.76 m3/s (2,110 cu ft/s)|
The Arga is a river of Navarre, in Spain, and is a tributary of the Aragón River, itself a tributary of the river Ebro. The Arga was known as the river Runa in antiquity. Situated in the north-east of Spain, the river stretches some 145 kilometres (90 mi) and has a basin of 2,759 square kilometres (1,065 sq mi), of which 2,652 square kilometres (1,024 sq mi) is in Navarre and the remaining 107 square kilometres (41 sq mi) is near Arakil. The source of the river is to the north of the village Esteríbar, near the border with France, and it empties into the Aragón River near Funes.
At the upper basin, the river is mainly surrounded by beech trees and beneath these grow bilberries, Cornish heath, sedges and luzulas. Additionally, a variety of shrubs can be found in the proximity of the Eugui reservoir, including; alder, ash, maple, common hazel and buckthorn. After the dam, the lower river is lined with oak and Scots pine trees and boxwood shrubs.
At the point where the river passes Huarte/Uharte, crack willow appear. The shrubbery around the area of Belascoáin marks the change from Cantabrian forest to more Mediterranean plant life; black poplar and white willow are common in this region.
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