Your mission, should you choose to accept it, is to figure out how many people a single contiguous urban area of your choosing can hold. Your minimum is 35 million people, this being the metropolitan population of greater Tokyo.
(The Guangzhou-Hong Kong sprawl has 42 million people, but it's difficult to tell whether it really counts as a single city, since China uses different definitions than the rest of the world and population density is hard to gauge due to the massive itinerant population there.)
(The Guangzhou-Hong Kong sprawl has 42 million people, but it's difficult to tell whether it really counts as a single city, since China uses different definitions than the rest of the world and population density is hard to gauge due to the massive itinerant population there.)