You decide to walk through the forest. It's kind of quiet inside this forest, and the trees are very dense.
So dense, you can't even see where you came in from!
You turn around and start wandering, looking for where you came in. Your Boy Scout instincts tell you otherwise, but there's no one looking for you, and there's no idea how long until you're found!
Eventually, you find yourself by a swamp.
You find this is interesting, since the land suddenly went from Forest to Swamp.
You take a step to walk around the swamp but suddenly your feet sink into the mud. Better pull them out.