(unnamed)

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(unnamed) flows into Onin erreka , which it joins at the following points: 39 km of total upstream flows in at N 43° 14′ 51″, W 1° 42′ 11″ at OSM node n2314937230 25 km of total upstream flows in at N 43° 14′ 50″, W 1° 42′ 46″ at OSM node n8385207505 load it's distributaries

(unnamed) has 2 tributaries.

• Urrabako erreka, which joins it at N 43° 14′ 50″, W 1° 42′ 46″ at OSM node n8385207505, and 50 km of total upstream flows in.
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• Gaztegiko erreka, which joins it at N 43° 14′ 49″, W 1° 42′ 45″ at OSM node n8385207504, and 1 km of total upstream flows in.
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