The World
The world of Raiders takes place on the receding, desertified ocean floor. Husks of crashed bombers, ships, cargo containers, whale skeletons, and more litter the salt-stained dunes.
Settlements
From these sweltering dunes, settlements have appeared, assembled from whatever their denizens are to scavenge. Eking out an hard-scrabbled existence any way they can in the wasteland, the denizens of the settlements have become hardy survivors over the years.
Industry
Industries such as garbage scavengers, scrap smelters, camel ranches, and more have also emerged in order to provide resources and materials for these settlements.
Caravans
These resources are transported to the settlements via the use of caravans, hundreds dotting the landscape, carrying their precious cargoes of resources, scavenged old-world treasures, and travelers.
Raiders
So what's the by-product of all these settlements, industries, caravans, and tribes? Raiders. Your people -- a people possessing a long and proud tradition of sticking their middle-finger up at the notion of a hard-day's work and choosing the marauder's way instead.
Of course, a raider party will have to consider who they attack. Caravans pose the easiest targets, but as a raider organization grows, industries, settlements, and citadels will eventually pose more tempting targets...
The world is a chaotic place.