Business Insider: China is building the world's largest city — and it already has more people than South Korea

For the past decade, China has been on a mission to build the world's biggest city by combining a number of large cities into one giant megacity.

With a current population of roughly 57 million housed inside a 15,000-square-mile perimeter, the Pearl River Delta is a region roughly the size of West Virginia but with 30 times more people. [...]

Each city's population ranges from nearly 2 million to more than 14 million, which, by 2030, China hopes to unite into an all-powerful megacity with an economic output around $2 trillion.

Whether that's feasible is still a mystery, but it's one the country is set on solving.

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