Neat, but predictable. It makes sense that those areas would be in the same map, and putting it far out there makes it look like a decorative planet. Birds, stones.
I have messed with this sort of thing myself. I didn't find anything like this though--I've flown around the Freezeflame Galaxy to see if anything became inactive as you got further away and stayed as such when you don't reach the area properly. The answer: not a lot. The part with the fluctuating water level fluctuated as it would (I had fun with Ice Mario there).
Another of my findings: Boo Mario is not a very good swimmer.
