User blog comment:Zathronas/Speculative author: My top 13 Questions for Volume 3/@comment-78.42.186.25-20141025092413/@comment-24435688-20141025131658

That's Menagerie. If it is a fifth kingdom, then it's probably the only one dominated by Faunus.

However, there's also the landmass to the far northeast that's in early copies of the map but not in others. Some have said that is was destroyed by the seas when the moon was damaged, but it might still be around and hold a lot of secrets.