Zhengzhou is a city of 10 million plus residents (2019), thus exceeding the largest USofA City, New York City, at 8.25 million. For note, there are only 10 domestic cities that exceed 1 million residents by the 2020 Census! In comparison, the largest city in the Peoples Republic of China is Shanghai at 26.9 million with Beijing at 20.3 million!
Few of us here realize that population fact and its related impact on how small localized disasters can have a significant death toll. Zhengzhou is on the Yellow River in central-north China, roughly parallel with the south tip of the Korean Peninsula and Japan’s south-most islands.
The China number is dated and probably larger now, but again the USA's 10 metro areas over one million population, China has 163 cities that size or larger.