https://www.belloflostsouls.net/wp-content/uploads/2016/12/faerunmap.jpgFaerun is a big place...
Edit: So, you stood at the SE corner of the current area map, and something south of that is problematic, or "could be a mistake"? Is Amn a mistake? What about Athkatla? Wait, that can't be right, can it? I mean, that's the setting for BG 2, it can't be problematic, despite the fact that it's much further south than you can actually travel on this tiny area map. If you click to zoom that map, and scroll all the way to the top, Baldur's Gate is about 1/3 of the way down the coast from the Northern edge of the map. It's just about at the Northern edge of the Moonshae Islands, which must also be problematic, since we can't travel there either, right?