Eberron - Return of the Lich Queen
Pirates, sea barons, merchant traders and all with a love of the water find their home in the Lhazaar Principalities. With a history that is equal part piracy and seafaring trade the Principalities have remained a separate entity from the kingdom of Galifar even during the years they pledged allegiance to the crown. Now, with the nation of Galifar officially shattered the Lhazaar Principalities have formed a loose confederacy of states each ruled by their own sea prince living a life where might makes right and the man with the most and biggest ships rule the sea.
Regalport, is the dominant town in Lhazaar. Located on the island of Greentarn it is home to the High Prince Rygar ir’Wynarn and is the seat of the Seadragon Principality. Port Verge, is also a notable locale. It is on the island of Questor and is ruled by Prince Kolberkon. It is the seat of the Principality of the Diresharks. Port Krez, a third less civilized town, sits on the island of Krag. It is the seat of the Cloudreaver principality and home to the Cloudreaver Prince Mika Rockface.
For more info: Eberron Wiki