Hi Vidgange! Thanks for your nice words.
I know I'm far from the most skilled at map making, but I feel good enough if I manage to spark or help keep alive discussions about world-building, because I love it and I feel there's not enough of it around here.
Durakken: thanks a lot for you assistance, it's been key to make up my mind...well, I still need to sit a few hours and deeply contemplate the implications of placing Arlia in Oncar or Inalia and decide which one fits best my needs, but I got the data I need. Some well deserved rep to you for your help.
EDIT:
I'll be damned Pixie, my eyes betrayed me and I didn't see you 18OCT post.
Great input! I love every word of it. I'm so glad I looked back.
Indeed, I've settled to move Arlia to Oncar and viceversa.
Mm, I'm not sure about giving Arlia horses as an specialty tough, since they already have an edge in weapons and at the time of the story are developing the first stable gunpowder, at least on that side area of the continent (I'm not sure yet about what's going on in the far East), I don't want them to be too overpowered versus the Empire.
And about Arlia's ambition's on the west lands of the strait belonging to the Empire... I'm not sure either. To begin with, people on the Empire have a big superiority complex over anyone else, specially Arlia, who wasn't so powerful until recent times, and who they don't trust and don't like its colonies on Acelor's coast.
The "Dukes" (who control the provinces) lineages are not typically local, they come from loyal men of the King/Emperors, well bred into the imperial mentality and culture. I can't see a culture with pride on the level the Greeks had about themselves be willing to give themselves up to be ruled by the Arlians, who they consider inferior.
Some of the "Dukes" would rather be independent or the Empire be more of a federation rather than a centralized monarchy, but they know both the Empire and Arlia would fight them to get the province, so as they see is safer to stay in the Empire, but with a weak Emperor to be autonomous in practice.
So it's mostly a cultural/ideological impediment that limits Arlia's influence on their other side of the strait.
Thanks for solving my doubts about the strait crossing, as is something I definitely need to know about for the story.