
That's pretty much it. There's also a statement that the garleans learnt about the primals there, when the local beast tribes tried (or succeeded, maybe?) to summon them.
There's nothing else. I'd suggest you design your backstory to be inside Eorzea proper instead. There's more lore of the city-states and being from another continent will certainly come out during interaction from other players. They will ask about it and you will either have to make up information or you'll have to use the "I'm from a village/town that was secluded from the rest of the continent; the first is bad because official lore might come to light and clash with what you said, the second is bad because it puts in question why you chose to be from that continent if you weren't going to be really a part of it.
There's nothing else. I'd suggest you design your backstory to be inside Eorzea proper instead. There's more lore of the city-states and being from another continent will certainly come out during interaction from other players. They will ask about it and you will either have to make up information or you'll have to use the "I'm from a village/town that was secluded from the rest of the continent; the first is bad because official lore might come to light and clash with what you said, the second is bad because it puts in question why you chose to be from that continent if you weren't going to be really a part of it.