Oiartzun River. It rises in the foothills of Bianditz, on the border Guipúzcoa and Navarre. It is soon joined on its right by a stream that flows down from Arditurri, and then receives on its left the Karrika stream in Alzibar and another that flows down through Ugaldetxo. In Rentería it receives the Artolaza, Segotegui, Mizpirazarreta, Pontika and Zillarguillene streams. In the municipalities of San Juan and Leio, it is joined by the Erroteta, Izotegui and Zubitxo streams. The River Oyartzun passes through several districts of Oyarzun and Rentería. Its course, some fifteen kilometres long, is not very fast-flowing, but it produces terrible floods.
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