This is where we keep track of all the technical stuff so the universe doesn't collapse in on itself. I'll need your help keeping an index of all the important people, places, things, and factions. Just to start with, here's some stuff that's already been talked about in the Illuminati Chamber:
The Dirty Island is about the size of Hawaii and the tail of Alaska put together. It's not a big continent island, but you'd be able to quite easily find and point angrily at it on a poorly constructed 1800s globe/world map. Big enough to contain a nearly island-spanning, pre-steampunk megalopolis or two, with some room for rum farming and manufacturing, spooky wilderness, and vast expanses of spooky voodoo swamps.
This doesn't take place in the actual world, so the sea can be expanded as needed to fit in as many islands as needed in any space that's not already taken up. Whether the whole world is an ocean or there are some huge continents is up to the rest of you.
Krakens, ghosts, skeletons, magic, fantastical creatures, are all welcome. Just try not to collectively veer too far away from piracy and into regular 1700s-punk fantasy. Of course there has to be lots of non-pirate things and societies in the world to facillitate the existence of pirates, but this is still primarily about pirates.