Średnia

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Średnia flows into Supraśl , which it joins at N 53° 9′ 7″, E 23° 35′ 18″ at OSM node n1814160488, and there 86 km of total upstream flows in. load it's distributaries

Średnia has 1 tributaries.

• Sianozatka, which joins it at N 53° 9′ 16″, E 23° 35′ 26″ at OSM node n4217875318, and 2 km of total upstream flows in.
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