Thread:Spencerz/@comment-100066-20120229030324/@comment-1713281-20120229062334

I was always under the assumption that Eurth was either an alternate reality without a conventional Earth-Number naming system (much like Brilliant City or Earth-Mesozoic24), or it was a dimension inside of Mainstream Continuity (à la Heroes Reborn).

Additionally, the Appendix refers to it as an "Alternate Earth", while the talk page for Eurth here at the Database shows the concensus to be that it's a planet located in the Earth-616 solar system. I'm not really sure which is correct, but my money is on it being a dimension or planet of Earth-616.