Proposed Canon
Seaworld is the capital of the side of Seaworld and a port. Queen Eliteabit makes her home there.
It houses the vast bureaucracy used to maintain Seaworld's vast maritime empire.
The ships HMS Superbia, HMS Hubris Unsinkable, and HMS Hubris Unsinkable II popped and launched from there.
It may have a palace. It has a ball room and a smoking room.
 Real World References
Like the side, the name is a reference to the Sea World resort.