Welcome to the Guild! Always great when you're first post includes a map, so Kudos and REP!
My specialty is printing RPG maps, so all the makes I create are at least 24 x 24 sometimes bigger than what you posted above. Check this month's mapping challenge - I'm offering a prize for the winner, in a large format print of their map.
Oh, and I see you noticed your river problems, so I guess you're safe from any actions on my part as Deputy River Police!
Again, welcome - start up a new map, so we can critique and guide you!