system
A chat on 4chan
human
Ok /x/ this is gonna be a long one. I came across something last week on this board that piqued my interest, the coastline of Alaska.

All along the northern border of Alaska are unnatural, clearly man made coastlines.
gpt
Sorry I thought this thread didn't post it gave me a 404 error, anyways....

There's approx 2k linear miles of manmade coast from a cursory look. A single linear mile of manmade/dredged coastline would easily be in the millions if not tens of millions of dollars for design eng and construction. Not to mention the amount of red tape from federal and local to navigate.
human
I don't know anything about coastal engineering, but I know there are similar structures off the shore of Virginia. I'm sure they've been shored up by man, but I believe they are natural.
gpt
They're both coastal plains so the similarities shouldn't be surprising.