A wrecked Red Cross supply plane on the Ripper side of the Lost Lake border. In Playing All Night, Deacon sneaks into Ripper land to find antibiotics for Boozer here and has to kill a Breaker to get them.
The Breaker fight is the main event. Keep moving, dodge its charges and hit it with fire and your heaviest gun. After the fight you still have to ride the antibiotics out past angry Rippers at the border.
Skizzo sends Deacon because he distrusts Iron Mike's deal with Carlos. The Rippers have already stripped the cargo, leaving only enough to save Boozer after his arm comes off.
Crater Lake
Crater Lake is the far southern region built around the real lake and Wizard Island, the Militia's headquarters. It opens in the second half of the story and has the most encampment jobs and NERO research sites in the game.
Lost Lake
Lost Lake is the central region of the map, built around a resort lake that holds Iron Mike's Camp. It becomes your main base for the middle of the story and packs 6 Hordes, 3 infestations and Sherman's Camp.