Перя

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Перя flows into Серёжа , which it joins at N 55° 40′ 46″, E 42° 55′ 36″ at OSM node n4137246018, and there 496 km of total upstream flows in. load it's distributaries

Перя has 2 tributaries.

• Никулина, which joins it at N 55° 41′ 7″, E 42° 54′ 47″ at OSM node n4145102243, and 19 km of total upstream flows in.
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• (unnamed), which joins it at N 55° 42′ 12″, E 42° 53′ 1″ at OSM node n8066220345, and 295 m of total upstream flows in.
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