The world was once a boundless and endless place. No matter where you go there was always someplace new to visit. To say the world was any shape would have been small minded, it extended as far as the eye can see, and farther than what could be traveled.
But suddenly the world began to restrict itself. Fog rolled in and separated the various islands and countries. Those brave or stupid enough to travel met their ends, via the nightmares that dwelled within. Soon fog consumed most of the world. With only a small island left for mortal kind to dwell. Eventually the horrors of fog were forgotten, after the desire for adventure died. The last island of civilization Salida Island.
That's where most of the party lives. Either in the fishing town, the wilderness, or even the lighthouse temple.