Northern Ithania is the top half of the continent of Ithania. It is made up of Toren, Genria, Somrey, Hania and Dunway.
It is unsure whether Si, Sennon and Borra belong to Northern or Southern Ithania as they are all neutral parties to begin with.
| Spoilers from "Last of the Wilds"
However when Sennon and Borra join with the Pentadrians it is assumed it becomes part of Southern Ithania, as with Si for Northern Ithania.