Eio is a large island continent in the midst of a vast ocean. Nobody ventures far beyond the borders. The following is a list of major and minor cities on the continent, as well as a synopsis of the city and important businesses where detailed.
Black Diamond is the research and development capital of Eio, and is thought to be the de facto seat of government of the country. In truth, Eio is actually governed by the Phoenix Tribunal, a group of elected representatives from each major population area. Parliamentary politics nonwithstanding, the important part is that each major city and significant rural/suburban area has an elected official covering their area. While corporate entities do push to try to get their owned territories represented by those sympathetic to their interests, this practice is no worse than in other active representative democracies.
Black Diamond's population by rough percentages: (out of a population of 6 million)
A horticulturalist's dream, this domed city is a giant greenhouse and arcology.
Although it sounds magical, Emerald City is actually the military industrial complex of Eio, and focuses on big machines and bigger guns.
A oceanside city with a thriving seaport and dock, as well as a major desalinization plant.
The height of fashion and entertainment.