Plank Country

The Swamp is the first chapter of the campaign Swamp Fever in Left 4 Dead 2. The map begins with the Survivors leaving a derailed train that fell in front of a small town, which they had been using as a temporary safe room(though this part have, most likely, been deleted due to Dark Carnival's escape vehicle being a helicopter). The townspeople, who had been resisting both help and refugees, believed that they could barricade themselves in, seeing as it bordered a swamp. Unfortunately, judging by the lack of other Survivors, the plan failed, and everyone has either been killed, been infected, or simply left.

The box car has basic starting supplies; four first-aid kits and tier 1 weapons. Considering the fact that the train hinders progress further down the highway, the only way to go is through the abandoned town. The Survivors head through a village of shacks, and eventually reach an old cable-ferry where the crescendo event kicks in. Not only are the Infected attracted to the sound as it moves toward the Survivors, but they keep coming while the ferry goes back. In addition the survivors can fall into the river to their deaths. After the event is over, the group wanders through the swamp until they find the safe room at the end of the chapter.