I don’t know a ton about the different worlds. Honestly the first thing that popped in to my mind was how it reminded me of the smaller island off of the main island on Lost. Which is totally irrelevant. Sorry, it’s just how my brain works.
Still, my guess is that it isn’t a specifically different world. At this point I’m guessing that all the fairy tale worlds have merged in to one land, or that they’re still in the Enchanted Forest, just a small untouched corner of it.