A circle with a 690 meters radius is about half a square mile. The top 50 most densely populated cities according to Wikipedia all have over 20,000 people per half square mile, and that includes lots of European cities and even one in the United States:
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A circle with a 690 meters radius is about half a square mile. The top 50 most densely populated cities according to Wikipedia all have over 20,000 people per half square mile, and that includes lots of European cities and even one in the United States:
http://en.wikipedia.org/wiki/List_of_cities_proper_by_popula...