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World Largest Agglomerations
DirectionsFirst choose the number of cities by typing ‘100’, ‘250’, or ‘all’ – then try to achieve the highest population among 1M+ world agglomerations. Quiz is not timed.
Quiz Takers 
great quiz! Really enjoyed not having to stress about time too!
Hey, its a little bit weird, that cologne gets accepted for ruhr, because Cologne is definitly not part of the Ruhr-area, which, more or less 50 km north of Cologne, ranges from west (duisburg) till east (Dortmund) with relatively little north-south-extent, containing as biggest cities Dortmund, Essen, Duisburg and Bochum (amongst several others over 100.000 population).
The source site (citypopulation.de) changed to include Cologne as part of the Ruhr agglo, and not its own separate one.
Hey Darren, mind adding the source for this one? Doesn’t seem to be Demographia’s World Urban Areas list this time.
I think I misspelled your name lol, forgive me.
citypopulation.de
Thanks!! Do you still use the Demographia list in any of the quizzes? Or am I just confused, ha?
citypopulation.de is my only source for population numbers