estuaries are where freshwater leaves the country lol | Hacker News

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		skeezyboy 8 months ago \| parent \| context \| favorite \| on: Why Do Swallows Fly to the Korean DMZ? estuaries are where freshwater leaves the country lol

hinkley 8 months ago [–]

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.

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