User blog comment:Timeoin/Elder Scrolls Online: Lore Revealed/@comment-5782057-20130925221215/@comment-13446185-20130925232035

http://images2.wikia.nocookie.net/__cb20130822162906/elderscrolls/images/1/10/Tamriel-map.jpg

Notice in this map picture that not the entire thing is shaded in a color. I'm guessing unshaded areas are either not playable yet, or not considered part of the alliances.

Could be both.