I was reading this article on China in the Times, and I started thinking about how many cities there are in China. According to this list that I found at UCLA, there are over 99 cities in China with populations of more that a million people. Most of these cities I've never heard of- Tianjin, Qingdao, Shenyang, and Guangzhou all have more than three million people. According to this table at Travelgis, there are only 22 cities in the world with populations of more than five million people- surpringly the largest one is Seoul, with about 10.8 million residents.