(unnamed)

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(unnamed) flows into Rio Marreco , which it joins at S 24° 40′ 22″, W 54° 2′ 29″ at OSM node n3053768177, and there 69 km of total upstream flows in. load it's distributaries

(unnamed) has 3 tributaries.

• Arroio Marreco, which joins it at S 24° 39′ 30″, W 53° 53′ 30″ at OSM node n2417788552, and 23 km of total upstream flows in.
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• Lageado Azul, which joins it at S 24° 39′ 32″, W 53° 58′ 43″ at OSM node n2417254107, and 15 km of total upstream flows in.
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• Córrego Três Voltas, which joins it at S 24° 39′ 28″, W 54° 0′ 21″ at OSM node n2417254203, and 6 km of total upstream flows in.
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