User blog comment:The Bespectacled Guy/On World of Remnant 2/@comment-4010415-20140919083937/@comment-4010415-20140919102753

Based on the Vale point on the map and the placement of the City of Vale, we can probably assume that kingdoms are much larger than just the points on the map. The points may just signify the centers of the kingdoms.

So, the settlements of the kingdom of Vacuo, overall, may be in both the desert and that green area. Sun is most likely from the desert area of Vacuo, given his attire and the fact that "it's not exactly a suit and tie kind of place." After all, it makes sense that someone would prefer to wear an open shirt when growing up in a desert.