# According to statistics released by UN, there are 28 megacities (cities with more than ten million population) in the world by 2014. Six Chinese cities are in the list: Chongqing, Shanghai, Beijing, Tianjin, Guangzhou & Shenzhen. Among them, Chongqing, Shanghai and Beijing have over twenty million population.
# In China, there are 142 cities with more than one million population. Whereas in 1978, there were only 29 such cities
# The three most important city clusters in eastern China, namely Beijing-Tianjin-Hebei Region, Yangtze Delta Region (where Shanghai is) and Pearl River Delta Region (Guangzhou), home to 18% population (about two hundred million people), constitute 2.8% territory yet contribute to 36% gross domestic production of the whole country
*** population here refers to residential population instead of population with registered permanent residence