The contiguous urban area of Chongqing is about 12 million. You get 18 million if you count all the urban areas contained within Chongqing municipality, which i

The contiguous urban area of Chongqing is about 12 million. You get 18 million if you count all the urban areas contained within Chongqing municipality, which is the equivalent of counting Beijing-Tianjin as being a single city, or even Guangzhou-Dongguan-Shenzhen.