This helps me better visualize the novel's contents, because I get a better idea of where everything takes place, the climate of the area, and the landscape. I know that there are cotton fields in Oria, and this fits in with modern-day central America. Also, this map shows me just how powerful the Society is; they are controlling nearly the entirety of North America. Also, it shows how similar everyone's lives are; that location doesn't change the fact that everyone is Matched to someone they don't know (most of the time), and is under the power of the Society.
In the book, it says that The Outer Provinces and River Sisyphus (the largest river in North America; the Columbia) were meant to be West of Oria; that Central was IN Oria Province; Acadia had to be "many miles" East of Oria and full of "rock and forest"; Tana had to border Camas.
What I did differently from Aimmy Arrowshigh is that I made the Outer Provinces actually border the Society in the south. I found it logical that if they were 'outer' they must be on the outside protecting the important provinces in the middle. Also, I made Centra in the current geographical center (even though this would probably change in a cataclysmic shift) of North America, as opposed to just the center on the US. I figured that after such a fall in the government, then a rise of a new one, there'd be no separation between Canada and the United States (and Mexico), and it would be one large country split into many different provinces. I also decided to separate Oria from the Farmlands, because in the book, it says that Cassia's mother and father were from different provinces, and both came to live in Oria.