Megacity

A megacity is usually defined as a recognized metropolitan area with a total population in excess of 10 million people. Some definitions also set a minimum level for population density (at least 2,000 persons/square km). A megacity is a single metropolitan area or two or more metropolitan areas that converge upon one another, or metroplex. The terms megapolis and megalopolis are sometimes used synonymously with megacity.

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In Canada, a megacity can also refer informally to the results of merging a central city with its suburbs to form one large municipality. A Canadian megacity, however, is not necessarily an entirely urban area, as many cities so named have both rural and urban portions, and do not necessarily constitute a large metropolis. This definition is thus close to the metropolitan area concept.

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Metropolitan area: A metropolitan area is a large population center consisting of a large city and its adjacent zone of influence, or of several neighboring cities or towns and adjoining areas, with one or more large cities serving as its hub or hubs....

Population: :For the use of the word population in statistics, see statistical population....

Megalopolis: Megalopolis (Greek: large city, great city) can mean:...