Only the box is a world of its own.
Centria is a vast area northwest of Pandopolis. Easily the most densely populated region within the box, it is filled with smaller and larger cities, coastal villages, as well as large areas used for farming, mining, and harvesting all the earth has to offer in order to sustain Centria's population.
Ark City is the largest city within Centria’s borders. Some of Pandora’s tallest buildings and most impressive feats of architecture can be found in Ark City. The city prides itself on its diversity; no two streets within it are the same.