(unnamed)

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(unnamed) flows into Rio Irapuá , which it joins at S 30° 21′ 41″, W 53° 10′ 37″ at OSM node n3610031575, and there 512 km of total upstream flows in. load it's distributaries

(unnamed) has 2 tributaries.

• Arroio Lajeado, which joins it at S 30° 23′ 12″, W 53° 15′ 10″ at OSM node n6242443468, and 23 km of total upstream flows in.
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• Arroio dos Niza, which joins it at S 30° 23′ 8″, W 53° 15′ 9″ at OSM node n6242443465, and 17 km of total upstream flows in.
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