I mean where are they located. So the survivors can explain how the area looks. Ruins of old cities covered in sand. Not a drop of water to be found for miles... Houses made to survive in other climates and locations. The houses crumbling because of the sand and stuff buffing them down over a few years. Did I mention the "Mutant" People? Something about organizations springing up. Different human factions that are all doing their own thing like the ones trying to make that thing to take them over and stuff.