What's the region around China called in Strike Witches?

[Crescent Pulsar S]

For the life of me, I can't seem to find any reliable information on it. Of the maps I've seen, it either lacks a name, or the color used to mark the territory doesn't seem to attach it to another nation. At least, I doubt it's a part of Karlsland's territory, if going by color. While its new territory is also in purple, Faraway Land is purple as well, and I believe that one's ruled by Britannia (whose color isn't purple).