From the list provided by Shan on Reddit, I'd say... Gandara, Desolation or Petrified Forest? Not entirely sure as can't see the available realm list yet XD EDIT: Decided to go on Petrified Forest, low pop :D
Yup, that's up to you how to interpret it. I actually see it as a naturally occurring forest, cause if you think about it the outside of Viridian forest is the same. The tree are always lined up that way for gameplay and art style purposes.