Большая Ерма

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Большая Ерма flows into Малая Бирюса , which it joins at N 54° 33′ 40″, E 98° 15′ 8″ at OSM node n441129874, and there 461 km of total upstream flows in. load it's distributaries

Большая Ерма has 2 tributaries.

• Средняя Ерма, which joins it at N 54° 30′ 50″, E 98° 22′ 41″ at OSM node n3889581266, and 54 km of total upstream flows in.
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• (unnamed), which joins it at N 54° 30′ 29″, E 98° 20′ 12″ at OSM node n3889580953, and 2 km of total upstream flows in.
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