Cities are home to half the world’s seven billion people, and China has not only the largest population but also the greatest urban network with more than 100 urban agglomerations of greater than 1 million residents, an account that is still growing. China’s urbanization in the last three decades has been unprecedented in scale: about 300 million people have moved to the cities from rural areas, supporting the country’s rapid economic growth. With an increase of 26% since 1990, about 60% of the total population lived in urban areas by the end of 2017.