The Arga is a river of Navarre, in Spain and is one of the tributaries 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, and has a basin of 2,759 km², 2,652 km² of which is in Navarre and the remaining 107 km² 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.
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