(unnamed)

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(unnamed) flows into the sea: 24 km flows in at S 41° 0′ 32″, W 73° 22′ 11″ at OSM node n2353658460. (unnamed) flows into Río Negro , which it joins at S 40° 56′ 6″, W 73° 14′ 56″ at OSM node n248741841, and there 8 km of total upstream flows in. load it's distributaries

(unnamed) has 2 tributaries.

• Río El Toro, which joins it at S 41° 0′ 39″, W 73° 21′ 40″ at OSM node n2353658509, and 19 km of total upstream flows in.
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• Río Las Juntas, which joins it at S 40° 58′ 42″, W 73° 15′ 6″ at OSM node n248741694, and 8 km of total upstream flows in.
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