User blog comment:David Bear/Sonic's home world is in fact Mobius, not Earth/@comment-25685240-20130419215846/@comment-477304-20130419220438

Indeed, the map in ShtH looks very similar to earth, but SU contradicts this. I'd say that the series takes place on a planet based on our earth.

The reason why this image isn't a link is because you didn't post it as a link, if you hyperlink wiki images, they show up in full like that.