Yaarel
🇮🇱 🇺🇦 He-Mage
Ok. But.The authors intended that the planet was Earth-like, for the same purpose they gave it only one moon or 4 seasons: for easy-to-use for new DMs to homebrew. That was the original intention, at least. They revealed that in one of the preview books.
So, following the authors' intentions, the map of Conquest is just a very small part of the World, that doesn't even contains all the places they described in different books.
The map of Conquest isn't even that reliable source, anyway. The map was created with a different intention of that of the Nentir Vale's setting, adding places from Mystara and Greyhawk, and creating some contradictions (such as the location of the Vault of the Drow). As with everything Nentir Vale, we don't have to take everything as written on the stone.
If the Nentir map itself is wrong.
Why try to stick something wrong into an other planet that was already doing fine without it?