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 in the province of Alava. 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.

Arga (Runa)
Bridge (early 11th century) over the Arga river at Puente La Reina
Location
Country	Spain
Region	Navarre
City	Pamplona
Physical characteristics
Source
• location	near Esteríbar
Mouth
• location	Aragón River
• coordinates	42°17′48″N 1°47′7″W
Length	145 km (90 mi)
Discharge
• average	59.76 m3/s (2,110 cu ft/s)
Basin features
Progression	Ebro→ Mediterranean Sea

The river is dammed in the Eugui reservoir near Esteríbar; the dam principally serves the needs of Pamplona's metropolitan area, the largest city on the Arga.

Vegetation

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.

See also

• List of rivers of Spain

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[de] Arga (Fluss)

[it] Arga

[ru] Арга (река)