#Business Insider writes:
China’s Pearl River Delta is swallowing up nearby cities. As the largest urban area in the world, the region features a population of roughly 42 million housed inside a 2,700-square-mile perimeter. The Pearl River Delta is made up of nine cities, each boasting populations above 1 million. And China is combining them all into one giant megacity. It’s bigger than Canada (pop: 35 million), Australia (pop: 23 million), and Argentina (pop: 41 million). The PRD began as a rural region with an agriculture-based economy. Urbanization didn’t take off until the early 1990s, when factories and big business flocked to the region and brought with them millions of new residents.