Nice job. You have a bit of a river issue - one doesn't get a network where the same source drains into the sea in two places. You could probably break the sea to sea chain in one spot, and it'd leap into being plausible - say, somewhere in the venomvine expanse.

A narrow bit of water is a strait, btw, unless your realm's mappers are emphasizing it's the 'straighter' way to get from Lockdale to Emerald Harbor :-).

Is there more of this world, or are you going to keep your players in Trevosha? I'd like to see more, when you feel like extending 'the known world'...