For simplicity and for a way of geographically visualising the landscape of Addriah, I suggest we use a map. Whilst a fantasy map may be better, I suggest for the sake of simplicity and so that anyone can make their own map for a specific purpose (for example if I wanted to mark out the location of a town, or an empire or a mountain range) we all use the map of the world (and replace nations with fantasy names).
So, out what has been mentioned so far we could potentially say that:
Yellow encompasses what @Chrome has termed collection of states known as the ‘Lands of the North’ or ‘Svijod’, whilst blue encompasses what he has called ‘the Middle Kindoms’. Red would encompass the geographical/cultural region known as Meditatios, due to these states being situated on the Meditatios sea. Black could represent the state that @Ricky has called the ‘Kango’.
Just a suggestion, and if people like the idea but not my particular designations of those locations then we can decide on new ones.