In Left 4 Dead 2, there are a total of five unique survival maps. These maps are:
The Parish: This map is set in the New Orleans French Quarter and features a wide variety of zombies, including the new Jockey and Charger zombies.
The swamp: This map is set in a bayou and features alligators as well as zombies. Be careful not to fall into the water, as the alligators will attack you!
The plantation: This map is set on a former plantation and features both zombies and hostile human survivors. Be careful not to get caught in the crossfire!
The asylum: This map is set in an abandoned asylum and features both zombies and hostile human survivors. Be careful not to get caught in the crossfire!
The port: This map is set in a port city and features both zombies and hostile human survivors. Be careful not to get caught in the crossfire!