Ah, you’ve found the maps that we know as ‘extra’. I recently discovered just how close it was to the overworld this year when seeing how far we could extend the wilderness and was a little disappointed to see how close they were. Those maps are generally areas that fall into the category of either an area that is to be instanced or an area that exists in another realm (rune alters etc). The dungeon map is even further north of those...
How hard would it be to move those maps elsewhere? Aside from Wilderness, they seem like they'd be quite in the way of Acheron...
It would be a hefty task to move them all as there is a lot of content up there, including both raids. Fortunately for something like Acheron we could fake it on the world map in a similar way the in-game dungeon maps are put together. However, I can't see the wilderness ever being expanded with a new bit of continuous land - it would require some kind of transport system to get there so it too could be 'faked'.
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