Today, there are about 30 megacities in the world, where more than 10 million residents live. The largest is Tokyo, at about 38 million. Recent announcements by the government of China could lead to the worlds' first gigacity (for want of a better term, used here to denote a city of more than 100,000,000 population, see note). According to the Nanfang Insider,
the economic integration of megacity Beijing, megacity Tianjin and eight cities (prefectures) in the province of Hebei would result in a city of 130 million. China Daily is a bit more circumspect, indicating that the Beijing supercity would have only 85 million.
The giga/super city would be tied together by new rapid transit lines and highways and surrounded by the 7th Ring Road, adding to the six that have already been built. The 7th Ring Road would consist of two roads, circling most of the area, and extending to a combined 850 miles (2,200 kilometers). By comparison, London's M-25 is 117 miles long (188 kilometers), the Moscow MKAD 68 miles long (109 kilometers) and the Washington beltway is 64 miles long (103 kilometers)
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Beijing Gigacity to Cover Area of Cambodia or Oklahoma | Newgeography.com
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