The world would consist of most desert as seen in the picture, the lighter portions of yellow being sandy dune like territory while the green is where all of the Kingdoms are located. The darker color surrounding the kingdom and spread sporadically across the world would be what they call Black Water. Water that can be sailed, although very dangerous, but is so toxic it has no other use. Most of the old world's ruins are located in the desert-like area's completely submerged in sand. These sandy area's are lethal, sandstorms containing glass like shards ripping through continuously. The surviving land where the Kingdom's call home contains dense forest surrounding the entire perimeter, beyond that, forest collides with desert and Black Water. In the surviving land you'll find animals thrive, a shared lake with clean water, all of this somehow missing the worst of the world's fires, able to grow back healthy.