Translation guide
A very large, heavily populated urban region consisting of multiple cities and suburbs that have grown together.
The speaker wants to refer to a huge, continuous urban area formed by the merging of several cities.
Direct loanword from English, widely understood in Japanese. Used in geography, urban planning, and news contexts.
The area from Tokyo to Osaka is called Japan's megalopolis.
Literally 'giant metropolitan area'. A more formal, descriptive term often used in academic or official contexts.
Loanword 'megacity'. Often used for a single huge city, but sometimes extended to a megalopolis. Less precise.
Tokyo is one of the world's largest megacities.
Over 30 million people live in this megalopolis.