Rio de Janeiro–São Paulo megalopolis

In 1999, Brian J. Godfrey wrote: "Even as Rio de Janeiro and Sao Paulo have sprawled to form the two main nuclei of an integrated megalopolis with a current population of between 30 and 60 million in southeastern Brazil, the two cities retain distinguishing characteristics.

[3] The entire Rio–São Paulo area is also sometimes considered a conurbation,[4] 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.

[4] As of December 2013, Rio de Janeiro to São Paulo is the third-busiest air traffic route by passenger volume, according to Amadeus.

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