Note
If someone is surrounded by walls no matter whether they're inside or outside, they must be in a metropolis.
Usages of metropolis
京都kyouto
Kyoto
都
metropolis
都市toshi
city
都市 is more generic than 市 and refers to the concept of a city as a populated and developed area. It doesn't necessarily imply a political or administrative boundary like 市 does. The term 都市 is more comparable to the English use of urban area or metropolis.
都心toshin
city center
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