This is a muddy area where small shallow bodies of water join together to make a swamp, broken up by trees and rock outcroppings. Strangler vines have overgrown the trees here and climb high into the branches above. Anglers lurk in the water, their presence only signaled by lures glowing just above the water's surface (at least until disturbed). A mostly-destroyed shed sits on the western edge of the area - some tools are the only contents which have survived.
The gnarled shallows appears only in Fallout 76.