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The Rio de Janeiro–São Paulo Megalopolis, also known as the Brazilian Megalopolis
The entire Rio–São Paulo area is also sometimes considered a conurbation, and plans are in the works to connect the cities with a high-speed rail. Yet the government of Brazil does not consider this area a single unit for statistical purposes, and any population numbers would be synthetic.
As of December 2013, Rio de Janeiro to São Paulo is the third-busiest air traffic route by passenger volume, according to Amadeus :
References
Rio de Janeiro–São Paulo Megalopolis Wikipedia(Text) CC BY-SA