Great Siem

Great Siem, heartland of the Underkingdoms is a central region relatively shallow in the Deeping, located in an area roughly bounded by Star Rock in the south, Val Verra in the north, Southport in the west, and Crossroads in the east. Its various subordinate cities all have passages which pass through Siem, the historical goblin capital, and it controls passages that link the other goblin underkingdoms. It's possession of Pyrmor, near Southport, enables a rich trade with surface-dwelling smugglers as their goods can be passed across the Bastion Line without ever touching a Bastonian-controlled port - at least, that was the case before the humans captured Southport outright.