User blog comment:IamJakuhoRaikoben/Chapter 370: Demons Reincarnated, Review./@comment-4449950-20140208032747/@comment-7418318-20140209225811

So if I showed you a map of around the year 0, which only showed Europe, but was still titled map of the world, would that mean that Europe alone is the entire world?

Mashima didn't draw the other continents, or even the entirety of the continent, because he had no intention of going far beyond the borders of Fiore in the story, so there was no need.

But from the Edolas arc we can pretty securely infer that the entire planet is called Earth Land. When traveling between planets you usually don't say "Let's return to our home continent" rather than "Let's return to our home world".