Quote:
Originally Posted by Minato Ku
There are 14,423,440 inhabitants around Manchester, UK.
100 km radius around a city is not a good measurement, in many case it just shows that a region is more densely populated.
England, Holland, Flanders, Northwest Germany, you get usually large figures for cities in those area because cities are close to each other.
More a city is located in a sparsely populated region, more its metropolitan area will cover a large surface because it's easier to move in an empty corner (less traffic, less stop needed for trains) and because there are fewer other towns around that are likely to attract people.
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When we’re talking about megacities (above 10 million people), the 100 km radius makes sense almost everywhere. A city this size has a massive gravitational pull over 100 km or had urbanized most of the circle.
In the US, for example, the big 3 has more people on their official metro areas than in the 100 km radius.