A Swamp

1. A piece of wet, spongy land; low ground saturated with water; soft, wet ground which may have a growth of certain kinds of trees, but is unfit for agricultural or pastoral purposes. Swamp - Wikipedia
2. A type of wetland that stretches for vast distances, and is home to many creatures which have adapted specifically to that environment.
3. (figuratively) A place or situation that is foul or where progress is difficult.