Elysium

Elysium was the name used to apply to possibly two places -- or one. One account states Elysium as a location where people could swim with the Obi-Amphibians (NA: Sky Pirates!) and another account states Elysium as being a lost Earth colony with at least one ocean. (NA: Parasite)

The latter account also refers to the Elysium system as being a "lost colony of distant Earth" and the site of the Artifact. (NA: Parasite)


 * It is also possible that, whether or not these are the same Elysium, that the Gates of Elysium existed on or in proximity to the afore mentioned places. (DW: The Stolen Earth)