Changzhou, referred to as Longcheng for short, is a prefecture-level city under the jurisdiction of Jiangsu Province, one of the central cities in the Yangtze River Delta, an advanced manufacturing base and a famous cultural tourism city, one of the 27 cities in the central area of the Yangtze River Delta, and a city in the Suzhou-Wuxi-Changzhou metropolitan area. As of 20 18, the city has five districts, 1 county-level city, with a total area of 4385 square kilometers. According to the data of the seventh census, as of 0: 00 1 1 on June 2020, the resident population of Changzhou was 5278 12 1. In 20021year, Changzhou achieved a regional GDP of 880.76 billion yuan, an increase of 9. 1% over the previous year at constant prices.