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At face value, ignoring its role as a metaphor, it doesn't make sense - it's literally the opposite of what's happening.

When you mix salt water and freshwater together, you don't get more freshwater - you turn freshwater into salt water. Replace "fresh" with "clean" and "salt" with "dirty" to make it more obvious.

estuaries are where freshwater leaves the country lol

They’re also where the tide comes in, and estuaries slow down water surges.

So up to a point they keep salt water from fully encroaching.

Lol! Got it all backwards like the whole of nk.

Let me fact check on my etch-a-sketch…

Yep, water still flows downhill.