Changzhou (Changzhounese: Zaon Tsei, ) is a prefecture-level city in southern Jiangsu province, China. It was previously known as Yanling, Lanling and Jinling. 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 located in the highly developed Yangtze Delta region of China extending from Shanghai going northwest. The population of Changzhou city was 4,592,431 at the 2010 census.