(unnamed)

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(unnamed) flows into Río Ucieza , which it joins at N 42° 13′ 20″, W 4° 24′ 56″ at OSM node n986566699, and there 343 km of total upstream flows in. load it's distributaries

(unnamed) has 1 tributaries.

• Arroyo El Berco, which joins it at N 42° 14′ 15″, W 4° 23′ 51″ at OSM node n8168108907, and 7 km of total upstream flows in.
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