North England kind of area: one hundred and thirty blah years into the future, it's possible that Leeds, Sheffield, Manchester and Liverpool could, if the populaton grew enough, link into one megapolis/mega city. I mean there's at most (i think) 90-100ish miles between Leeds/Sheffield and Liverpool with Manchester sitting in the middle, it's definitely possible and since the games all come from cities that fall within that megapolis, I'd say that's a likely candidate
*edit* oh and as for locations, ehm, it's over 100 years in the future, who knows what the place'll look like then? Could see P-Mar Project sitting somewhere in the pennines though
