While the term "city" can have different legal and administrative definitions depending on the country or region, it generally refers to a densely populated area with a defined boundary, a central administration, and a range of urban functions, such as commerce, industry, and culture.
Here are some examples of cities with defined boundaries:
* New York City: The five boroughs of Manhattan, Brooklyn, Queens, the Bronx, and Staten Island are all clearly defined.
* London: Defined by the Greater London Authority, which encompasses 32 boroughs and the City of London.
* Tokyo: Has a defined boundary and is the capital of Japan.
It's important to note that there are other types of urban areas, such as towns, villages, and metropolitan areas, that might not have as clear or legally defined boundaries as cities.