This post will have all of the cities on Gaia. If you have an idea for a city, just comment this post.
Roe - A city at the north part of the continent of Illaisa. It has trees on one side and the ocean on the other side. The only real way to get to this city is by boat, unless you really want to go through the huge forest that has who knows what in it.
Varo - A city on the continent of Crystus. It's a cold city and it's people like to get mad at the god or goddess of Ice for it's winter months.
Moonlit City - A city rumored to have made by one of the goddesses of the lands yet no one is really sure which goddess or anything. Even the history books are really unsure around everything. It can be found on the continent of Illiasa near the Academy and it's lake.
Sunlit City - A city that was build around the Shrine of the Sun. It is on the continent of Illiasa on the west side somewhere. (Thanks again Leve xD)
Astral City - A japanese like city on Lyias. It can be found western south on Lyias. It is near a lake. (Thanks again Leve xD)