Everyone thinks the swamp is flat.
But is it really?

is 2 feet deep slough
Even in the deepest slough …
I was surprised to find tiny hills of dry land.
The source?
Overturned trees cause roots and peat to locally pop up.

created both hills and trenches?
Meanwhile, that same effect also causes deeper trenches to form.
Or in other words, better watch where you step!
There’s nothing flat about slogging in a water-filled swamp.