Should have fixed up Ishgard while they were at it.
I kind of take it for granted that the areas we see are simply representative of an entire region, but we see it boiled down to the poin ts of interest needed for the story. So when I am in the Shroud, I assume it's 100s of thousands of acres of forest, and similarly for other zones, they are representative of much larger regions than we could realistically see in-game.