Certain tales share similar appearances regarding water beings drowning its victims in bogs, creeks, or lakes. One such tells about Jenny Greenteeth, who would definitely get the "Do Not Swim" sign near her waters!
In one part of the story, Mierna decides to take a "shortcut" through a swamp to reach the Faerie Palace. Unfortunately, it leads to more trouble than it's worth. Beware treading in these places! This one looks hungry.