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

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. It’s …