The Free City of Greyhawk, also known as Greyhawk City and the "Gem of the Flanaess," is a fictional city-state in the World of Greyhawk campaign setting for the Dungeons & Dragons fantasy roleplaying game. Since the setting was originally published in a folio and then again in a boxed set that were both titled World of Greyhawk, the word "Greyhawk" is often used to describe the entire campaign world setting, although the proper name for that part of the world is the Flanaess. Sometimes the lands controlled by the Free City are also referred to as Greyhawk, though the proper term for the region is the Domain of Greyhawk.