The Great Hall of The Guardians was a celestial chamber used by the Guardians of the Universe and was located in the Space Sector 0000 on the planet Oa. It served as a private meeting chamber where the Oans gathered in order to discuss matters of cosmic importance as well as received updates on the status on their Green Lantern Corps members through the Senior Administrator. The Great Hall consisted of a starry chamber with a central mass of emerald energy emanating from the floor as well as several black pillars rising in a circular pattern where an alcove sat on the top from which a Guardian stood.