>>20915342>>20917398>>20917997I already (kind of arbitrarily) designated these areas as our busiest ports and largest cities, and there just so happens to be one in the North-West. Ceding partial ownership of the city shouldn't be an issue based on the terms described, I don't think.
I like the Oppia name. As for the other five of the Six Ports, there's the Rivers of the Underworld in Greek myth: Styx, Acheron, Cocytus, Lethe, and Phlegethon.