Danaan is a place on the planet P3X-289, which is an ancient site that is located outside the dome on P3X-289. Danaan is in the region of Mahg Mar. Residents of the dome thought that it was the ancient ruins from when the Goa'uld System Lord, Morrigan, ruled over the planet. Danaan was also the original location of Stargate or "Gate of Mahg Mar", until it was taken and put on display in the National Museum of History. (SG1: "Revisions")