China to create largest mega city in the world with 42 million people

China is planning to create the world's biggest mega city by merging nine   cities to create a metropolis twice the size of Wales with a population of   42 million.

http://www.telegraph.co.uk/news/worldnews/asia/china/8278315/China-to-create-largest-mega-city-in-the-world-with-42-million-people.html