A big city or metropolis usually has associated suburbs and exurbs.

Such cities are usually associated with metropolitan areas and urban areas, creating numerous business commuters traveling to urban centers for employment. Once a city expands far enough to reach another city, this region can be deemed a conurbation or megalopolis. Damascus is arguably the oldest city in the world.

In terms of population, the largest city proper is Shanghai, while the fastest-growing is Dubai.

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