The Drowned Gorgon
Okay, so it's not exactly a wretched hive of scum & villainy but it is someplace you'd rather your mother-in-law didn't know you knew about.
The Eastern Ocean is the largest body of water known & permanent outposts are few & far between. Crossing the Eastern is no mean feat, taking months & ships are regularly lost on even the best-known passages.
The Drowned Gorgon is either the last piece of civilized rock before oceania incognito, of the first one you see on the other side. It's a sight for sore-eyes either way - and it's not really all that seedy. No one's gone missing from the Gorgon in at least two weeks.