I really like using images to store simple game data. They're easy to edit quickly, and easy to parse. The first of these is all the named regions of the game world. Each color is paired with a string.
The second is all the encounter zones. Red: 0, green: 1, blue: 2, orange: 3, yellow: 4
The third one tells the game which overworld music to use. (Yeah, the final island has its own overworld music, and it rules)


