(unnamed)

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(unnamed) flows into Río Pireco , which it joins at S 40° 44′ 13″, W 71° 49′ 56″ at OSM node n4360383784, and there 86 km of total upstream flows in. load it's distributaries

(unnamed) has 1 tributaries.

• Río Pereyra, which joins it at S 40° 44′ 46″, W 71° 51′ 56″ at OSM node n4360384728, and 10 km of total upstream flows in.
load it's tributaries