Changzhou is a prefecture-level city in southern Jiangsu province of China. It was previously known as Yanling, Lanling, Jinling, and Wujin. Located on the southern bank of the Yangtze River, Changzhou borders the provincial capital of Nanjing to the west, Zhenjiang to the northwest, Wuxi to the east, and the province of Zhejiang to the south. Changzhou is part of the highly developed Yangtze Delta region of China extending from Shanghai going northwest, which now has more than 36,000,000 inhabitants. Its total population was 4,592,431 inhabitants at the 2010 census whom 3,290,918 lived in the built-up area made up of 5 urban districts. The agglomeration is now part of the Suzhou-Wuxi-Changzhou metropolitan area which has now more than 36,000,000 inhabitants, only second in China after the Pearl River Delta Economic Zone.