China will establish the largest megacity in the world

It is has been predicted that China will merge nine of its cities into one, creating the largest metropolitan area on the planet. This new megacity has a population of 42 million - over 7 million greater than Tokyo, the previous record holder.

The cities being merged include Guangzhou and Shenzhen, the second and third largest cities in China with populations of 11.7 million and 8.9 million, respectively. This region covers much of China's manufacturing heartland, accounting for nearly a tenth of the Chinese economy.