The Damocles Gulf is an interstellar territory of the Eastern Fringes of the galaxy that contains a series of worlds belonging to the Tau Empire in the Segmentum Ultima. The Damocles Gulf Crusade was fought between the Tau Empire and the Imperium of Man there, and was the first time the two forces had met militarily. Previous to this conflict, the Tau had been unaware of the true size of the human Imperium. Despite the Ethereals' later instructions that the Damocles Gulf was to be off-limits to the Tau, the Tau Fire Caste's Commander Farsight established colonies there, known as the Farsight Enclaves, which have severed contact with the Tau Empire for unknown reasons.
- Codex: Tau (3rd Edition)
- Codex: Tau Empire (4th Edition)