City of Unaroyal
Real World References
"Unaroyal" is likely a pun on the tire manufacturer Uniroyal, particularly given their livery -- the "black torus" is probably a tire. the names of their cities seem to begin with "Una" and resemble an english word (ex: unibrow/Unabrow, unitard/Unatard). Also, the Jetstone cities on their former border are named after Bridgestone and Firestone, tire manufacturers which merged in the 1980s.