Igarapé Umacá

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Igarapé Umacá flows into Rio Içana , which it joins at N 1° 11′ 9″, W 67° 48′ 19″ at OSM node n3540005845, and there 1,668 km of total upstream flows in. load it's distributaries

Igarapé Umacá has 2 tributaries.

• (unnamed), which joins it at N 1° 16′ 0″, W 67° 42′ 44″ at OSM node n3540007637, and 3 km of total upstream flows in.
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• (unnamed), which joins it at N 1° 16′ 16″, W 67° 45′ 34″ at OSM node n3540007372, and 1 km of total upstream flows in.
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