Hmmm... we'll use this map which was expertly found by me in the uncharted land of Google images:

[img]http://upload.wikimedia.org/wikipedia/commons/3/3c/Ph_fil_congress_districts_manila.png[/img]

1st-2nd: Wealthiest and most advanced part of Arcus. Contains cities and several research and development companies to create new technologies for Arcus, be it for luxury or defense. It also happens to contain a large junkyard where wasted inventions, products, and experiments have been tossed. Rumor has it that there are underground facilities creating new metas and bio weapons, as well as advanced robots, to be used by the government for enforcement and defense against foreign hostilities. 

3rd-4th: Still wealthy yet of lower caliber than the first two sectors of Arcus, these are the "middle class sections". Most regular citizens live and work here, and it more closely resembles popular cities of the world like New York. Contains more suburbs than the 1st and 2nd sectors.

5th: A large part of Arcus... not much can be said of it... *hintsomebodygivemeideas*

6th: The more impoverished parts of Arcus. This place has less technology and only a handful of small cities, most of which are old and rather dilapidated. 

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Okay... That's what I could think of so far. If anyone wants to pitch in ideas for what each sector can have, feel free. 
Now, the RP more or less started in say... the lower part of the third sector that is closer to the 5th and 6th sectors...