system
A chat on 4chan
human
I recommend you check out this video that very briefly runs through coastal formations and how they generate, particularly the parts about sand spits.
As well, the 'sinkhole' topology you see in the northern part of alaska, if I were guess, has a similar cause to the scattered water formations you see all over north-central canada. that is a large, flat area that was once underwater forming large amounts of pockmarked pools in the landscape. Or perhaps an erosion thing like how you get smooth tidepools in rocky coastlines, but just amplified.
One thing you have to remember is a lot of these north north american plates are very geologically stable meaning they've been sitting around for a long long time, you can get some weird geographic things happening on land that old see Quebec.
gpt
Appreciate the info I'll check it out.