Осна

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Осна flows into Пьянка , which it joins at N 57° 31′ 20″, E 37° 11′ 11″ at OSM node n3193501984, and there 16 km of total upstream flows in. load it's distributaries

Осна has 2 tributaries.

• (unnamed), which joins it at N 57° 31′ 35″, E 37° 8′ 52″ at OSM node n11037039180, and 2 km of total upstream flows in.
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• Костериха, which joins it at N 57° 31′ 34″, E 37° 9′ 2″ at OSM node n5954250694, and 1 km of total upstream flows in.
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