Talk:Japan
The claim for the size of Tōkyō [at about.com] is based on estimates of "urban agglomerations." I think it'd be better to link to its sources ([Demographia]), not a second-hand source like about.com. (The Demographia 50 Largest World Metropolitan Areas list is [here].)
Second, if we're going to use the about.com/Demographia source, then it'd be better to cite the greater Tōkyō area (which includes other adjoining prefectures), rather than implying that there are over 30 million people in Tōkyō. [The official Tōkyō web site] places Tōkyō proper at 12 million. To further complicate matters, Tōkyō isn't even on Demographia's list of [World Municipalities over 7,000,000 Population] because of the definition of municipality.
Please note: I am not disputing the greater Tōkyō area's status as the largest metropolitan agglomeration in the world. I'm merely saying that it would be nice to be a little more accurate than the current article's claim that Tōkyō's the largest city. We'd have to clarify what we mean by "city."