20 Biggest Metropolitan Areas in the World in 2015

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17. Tehran

Estimated Population: 14 596 000+

Our seventeenth contender – Tehran – had its metropolitan area (known as Greater Tehran) officially formed in 1973 in order to unite a number of adjacent cities. From then, until the nineties of the past century, the metropolitan area saw a great growth spurt in its population, which was eventually extinguished – an event often contributed to different family planning.

tehran-642743_1280 Biggest Metropolitan Areas in the World in 2015

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