Hi, hi. It seems my powers of GMing have been called upon.

I'm a very 'story-first' rper, but story must maintain a coherent train of thought. The map defines the edge of the "known world". I don't think, story-wise, there would be any benefits to making more nations further across the map. Also, it hastens communications, so we aren't waiting several years to get a response.

As for the fish-people vs the boats... practically, it is unlikely that bones and wood could pierce a ship's hull. Remember, these boats were designed to ram head-first into other boats, until galleons, schooners and frigates were built, where they were designed to take solid chunks of metal fired at high speed . It would, at best, take a while and be fairly noisy, and at worse be totally ineffective. In reality.
But, like I say, I'm a story first kind of guy, so as long as both attacker and attacked are happy with the story that this attack might lead into, I have no qualms about the weapons being capable of penetrating wood.

Also, sovereign, I like the sig. Who/what is it?