conurbation

/ˌkɑnərˈbeɪʃən/
noun
  1. A large urban area formed by the expansion and merging of several towns or cities.
    • The Tokyo-Yokohama conurbation is one of the most densely populated areas in the world.
    • Urban planners study how to manage traffic and housing in a growing conurbation.
    • Many people commute daily between the cities that make up this conurbation.
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