I know, that colonge has only 1million inhabitants, but colonge is the largest city of the Rhine-Ruhr metropolitan region with over 11million inhabitants and is one of the largest area in eu.
http://en.wikipedia.org/wiki/Rhine-Ruhr
http://en.wikipedia.org/wiki/Blue_Banana
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"War is nothing but a continuation of politics with the admixture of other means."
― Carl von Clausewitz