[There is a neat though hastily-drawn map (http://www.zentendo.com/media/albums/userpics/10007/Aselia.jpg).]

This is Aselia, which once consisted of the two worlds Sylvarant and Tethe'alla. Though they're not proper nations, I suppose that would be the closest we have. Tethe'alla had prospered, so it is the one with better infrastructure; Sylvarant is more a collection of city-states without a centralized government.