This is kind of a "fun" post to talk about metropolitan divisions which is usually an area of several suburbs (As in not counted as part of the main municipality) that have something in common whether income geography etcetera. It is kind of cool to divide a metro into things like that and truly no large metro unless one were the main city is absolutely dominating sort of like Houston, Texas were I live, or sprawl is equal in all general directions; don't have these divisions. Even in the Houston example their are regions that people normally group as slightly separate in the Houston area like Fort Bend County, Galveston County, Montgomery County's but these don't really count. Real World Examples- North Shore Chicago- wealthy towns on the lake north of Chicago. Best Southwest Dallas- A region of Dallas that is known mostly for it's high AA middle class. NOVA- Northern Virginia suburbs that have their own CBD's and while connected to D.C is an impressive area of multiple million people Main Line- Philadelphia (collection fo historically wealthy suburbs) etcetera. This isn't just an American concept it is just that America popped to my mind first. As you can see they vary in sizes from as little as 160,000 people (Best SW) to more than 3.5 million (NOVA).
Here are some named and unnamed OGF examples.
http://opengeofiction.net/#map=12/20.4230/86.5541 South Gobras city Area- (unnamed) discussed this with indyroads???? or another mapper in the area a few months back that the economy while not solely based has a large amount of its GDP coming in from the grooming and breeding of horses.
http://opengeofiction.net/#map=12/20.6872/86.9204 East Gobras city Area-(unnamed), it is just a cluster of suburbs east of Gobras not sure what they would be known for.
http://opengeofiction.net/#map=11/18.8241/88.9934 Depending on the number of commuters the Marapura area and a few of the bordering suburbs can be called Gobrasi Khaiwoon or something.
http://opengeofiction.net/#map=12/29.7288/122.4718 Pargiter-Misselthwaite- This area of Wiwaxia could be called something as it is in commuting distance of Wiwaxmouthe.
http://opengeofiction.net/#map=12/36.1316/119.1189 Depending on Commuting patterns could be a metropolitan division of Pyingshum.
http://opengeofiction.net/#map=12/-24.4595/124.2962 Several areas of VC that can become a division.
http://opengeofiction.net/#map=12/-3.0231/-2.4503 Quentinsburgh North- Don't know if this is named but the coast between these two cities could realistically be developed into a Jersey Shore like area of suburbs that grew between Vandover-Laneston and Quentinsburgh.
This is the best example of what an article would look like about this division. http://wiki.opengeofiction.net/wiki/index.php/Troyan_Riviera