1) Hoenn---love it, tropical climate, waterways, pretty big, towns & cities were pretty interesting..though Sinnoh beats it out in this category
2) Sinnoh---took Hoenn to a whole new level. Cities vary greatly from one another too, it's huge but I feel like they didn't use the size fully to their advantage
3) Orre---Though it's small, I thought it was pretty neat. Like the arid climate, for some reason I thought of the middle east during this game...
4) Johto---small but okay, the whirl islands is the only reason I really put it above Kanto
5) Kanto---looks good in hg/ss remake, was okay before that..but really compared to Hoenn and Sinnoh it's kinda of.........crap imo.