Okonomo was a paradise-like island located on the planet of Alderaan. Every year, the Grand Alderaanian Gathering was held there, at the luxurious Okonomo Retreat. Around 32 BBY, the island was the stage of the so-called Okonomo Tragedy, during which the crazed geneticist Zeta Magnus unleashed a hive virus that caused all the attendees of the Grand Gathering to devour each other.