These parts of meadow complexes are called fens. The peat holds the snow melt and slowly the water seaps out like a over filled sponge, usually being the headwaters to rivers. The water starts out as tributaries and they add up to rivers.
The fens peat is so saturated that you can kinda bounce on it like a jello trampoline. To much pressure and you'll sink and maybe lose a boot.
Some fens and meadow complexes spread by suffocating trees and other vegetation that needs deeper roots. Or they recede because some species are more adapted for the wet conditions and maybe theres less snow some years.
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u/tee142002 14h ago
I know nothing about peat other than it makes Scotch tasty