Geo Island is mentioned.
Geo Island is one of the island in Radia's northern archipelago. Not much is known about this island at the current time (much of it will be up to the person who makes the chapter in which it appears!) It will be a focal point of the Gyth at some point in or after Chapter 5, as they plan to seize the Xana Crystal located there.
A character (SPOILERS) also mentions that they washed ashore at this island.