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On the outskirts of the Polish town of Wagrowiec, two rivers Welna and Nielba intersect at right angle, and almost impossibly, both rivers roll their waters on independently of each other without mingling. The two rivers run into each other, their waters start a whirlwind motion and then continue to flow out into separate riverbeds. Research has shown that mixing of both river waters in the crossing amounts to only 10%. This has been established by analyzing the water for biological communities that differ slightly in the two rivers. The differences have been found to persist even after the crossing. About 2.4 km down, Nielba eventually flows into Welna near Lęgowskie Lake.

wagrowiec-bifurcation-1

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