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The Baltic Sea has a very complex system of replenishing itself. It discharges around 940km3 of brackish seawater into the North Sea, while a subsurface layer of more saline water flow brings back 475km3 , this happens because of the different salinity levels.
The deeper you go in the Baltic Sea, the more saltier the water is.
The shortfall is made up of fresh water from over 250 rivers and streams that discharge into the sea, including the rivers Oder and Vistula.

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15y ago

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