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There is no such border between the North Sea and Baltic Sea. It's an urban legend spread by Reddit.

Waters of different salinity levels will mix quite easily when exposed to disturbances from wind, waves, and current. Salinity separation phenomena like haloclines are only stable in low-energy systems like caves or when constantly regenerated by persistent effects like surface evaporation. In either case, the halocline is a horizontal boundary (eg gravity puts the lighter fluid on top), not a vertical line

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10y ago

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