[bossabreezes]

Although South America is somewhat out of focus on this site, the metropolitan region between Goiânia and Brasília, Brazil is growing quickly.

There is about 100 miles between the two cities. Brasília has a bit over 3 Million inhabitants and Goiânia has about 2.5 million in it's metro, and these are the two fastest growing cities in Brazil.

The terrain between the two cities is somewhat rugged, although there is already a few cities (including Anápolis) with over 200,000 residents which sits between Brasília and Goiânia which is also growing rapidly. This region likely will not be strictly urban between the two, as Brazilian cities don't sprawl like American cities, but it will no doubt be a large conurbated urban center.

I can see Goiânia and Brasília being home to around 20 million people collectively in the next 30 years, which would make it one of the world's newest big metropolises. It is also a very wealthy region, with per capita incomes in both cities much higher than most other metro regions South of the United State. São Paulo and Rio de Janeiro might be the only cities south of the US in the Americas to have more wealth.