The craziest part is how these cities are rapidly merging, with the Pearl River Delta well on its way to becoming a single city at least in structure. Coupled with the Yangtze River Delta and the Bohai Economic Rim, with active policy to to connect the constituent cities. It makes London and New York seem like little villages. We're talking potentially forming a continuous megalopolis of quarter of a billion people or more within the next couple of decades, consisting of a handful of tightly connected megacities.