Actually, the East Island and Far East Island are thinner than Dwilight. It's just that Dwilight hasn't had enough protracted civil wars to really break up the realms. It's got the cities to break it up a lot more, it just hasn't happened. Not enough people ruffling feathers I think. That and the Astroist realms didn't want to declare war on each other for fear of pissing off every OTHER astroist realm.
Pretty sure I saw that linear geography named out a few times back when both of these islands got a little stale, too.
Not saying something better could have been done. Not really any easy perfect solution out there.
