Germany's largest metropolis is Frankfurt.
Many of China's metropoles constitute a city cluster, such as the Yangtze River Delta Megalopolis and the Pearl River Delta Megalopolis
 Second-tier cities are numerous and consist of regional centres, such as Changsha, Chengdu, Chongqing, Hangzhou, Jinan, Nanjing, Qingdao, Shenyang, Tianjin, Wuhan, and Xi'an, etc

