I'm thinkign of moving to Tokyo, Japan, have you ever been there?
I've never been there but I would love to visit!
It seems to be a major tourist destination since the Greater Tokyo Area is the most populous metro area in the world.
In the world? Wow that's actually crazy.
Greater Tokyo is also home to the world's most extensive urban rail network so I won't have to worry about buying a car when I get there.
Oh yeah I've heard that before, the railways there are insane!
Greater Tokyo Area
The Greater Tokyo Area is the second most populous Metropolitan area in the world, consisting of the Kantō region of Japan (including Tokyo Metropolis and the prefectures of Kanagawa, Chiba, Saitama, Ibaraki, Tochigi and Gunma) as well as the prefecture of Yamanashi of the neighboring Chūbu region. In Japanese, it is referred to by various terms, one of the most common being .
A 2016 United Nations estimate puts the total population at 38,140,000. It covers an area of approximately 13,500 km (5,200
city is defined as, "one having a population of 2 million and above".
Japan.
In Japan, it is division that has been set separately from administrative areas in order to define wide urban areas by the Statistics Bureau of the Ministry of Internal Affairs and Communications. 
The Greater Tokyo Area is the most populous metropolitan area in the world. 
- Central City (中心市)
- Those of the greater metropolitan areas are the 23 special wards in the metropolis of Tokyo and other designated cities.