| @ swellwrench: All the cities you called are very close to the Ruhr Area, but are not part of it. The actual Ruhr Area consists of Duisburg, Essen, Bochum, Dortmund, Wuppertal and some smaller towns like Bottrop and Oberhausen. They really make one urban area, almost without green zones between the different cities.
Düsseldorf is very close to the Ruhr Area, so you could consider it part of it. Cologne and especially Bonn are further away and really not part of the Ruhr Area.
It depends highly on what you consider an urban area. This might for instance be the only quiz where Guangzhou is bigger then Beijing and Boston even comes close to Dallas or Houston.
I liked the quiz, it gave some surprising outcomes. |