The home planet of the blue-skinned Bolians, a long-standing Federation member world that is mentioned many times in the Next Generation era but is never visited on screen.
Bolarus IX is the homeworld of the Bolians, the blue-skinned humanoids with a ridge running down the centre of the face who serve throughout Starfleet in the 24th century.
The planet is first named in The Next Generation episode Allegiance, in which the kidnapped cadet Mitena Haro is said to come from Bolarus IX. Later series refer to the world mostly through its people and institutions, most famously the Bank of Bolias, which Deep Space Nine treats as a major financial house.
Although Bolians such as Mot the barber, Captain Rixx and Chell of Voyager are familiar faces, the planet itself has never been shown, so its appearance and geography remain unestablished.