The lore actually states that we only know a part of Atys (the New Lands). It is just that we have no access to the rest of the planet. Certain people have access to certain unseeable parts though (e.g. Rangers ?). It is quite possible to imagine that a region is now "open" to every homin of the New Lands.
It can also be a part of the Old Lands, which were way bigger than the New Lands. In short, there's a world of possibilities.
It can also be a part of the Old Lands, which were way bigger than the New Lands. In short, there's a world of possibilities.