The North Continent was home to Ezra, so large that it could be seen as a world of its own.
There existed other continents, but the travel between them was so extensive that many people lived their lives as if other continents never existed.
The difference was not simply in distance; it was believed that natural laws and races differed on other continents.
For instance, the Arch Gods were seen as the divine beings of the North Continent, but it was possible that other continents had their own gods and supreme beings.
They could have their own practices that weren't the same as the magic of the North Continent. That was just how large this world was. But maybe this was all for the best.
For those people on top, like the kings and the rulers of races, they have seen the other continents, but they never tell what was seen, and all information about the other continents was sealed as classified information accessible only to those at the top.