Asia. It contains 15 of the world's 27 megacities (≈56%). The next highest would be Europe with 4.
There are 28 megacities as of March 2013
Another list defines megacities as urban agglomerations instead of metropolitan areas. As of 2010, there are 25 megacities by this definition, like Tokyo. Other sources list Nagoya and the Rhein-Ruhr as megacities.
As of 2007, there were 18 megacities according to "Living in the Environment, 15th Ed., G. Tyler Miller, Jr." See Chapter 23 on Urbanization and Transportation. It's possible that this information is now considered to be outdated. It should be noted that megacities can alternatively referred to as megalopolises.
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Who Knew - 2010 Megacities 3-54 was released on: USA: 16 March 2011
People often live in megacities in order to be close to work or to find work. A pressure faced when living in a megacity might include the pressure of long lines for transportation or a high cost of living.
million cities or megacities
Two of South America's megacities are Sao Paulo and Buenos Aires of Brazil. The third South American megacity is Rio de Janeiro, Argentina.
urban polarization is the process by which megacities become so dominant, they limit urban development elsewhere in the country; they end up becoming closer tied with first world megacities than their own hinterlands. This leads to a process of cumulative causation.
There is one continent in Asia - Asia.
beacause its have a many damage can be the rivers in Asia