Chongqing, is a major city in central-western China. Administratively, it is one of the People's Republic of China's four provincial-level municipalities, and the only such municipality in western China. The municipality was created on 14 March 1997, succeeding the sub-provincial city administration that was part of Sichuan Province. The municipality of Chongqing has a registered population of 31,442,300 as of 2005. The boundaries of Chongqing municipality reach much farther into the city's hinterland than the boundaries of the other three provincial level municipalities (Beijing, Shanghai and Tianjin), and much of its administrative area, which spans over 80 000 km², is rural. It has jurisdiction over 19 districts, 17 counties, and four autonomous counties. The population of the urban area of Chongqing proper was 5.09 million (2000).The municipal abbreviation, Yú (渝), was approved by the State Council on 18 April 1997. Chongqing was also a municipality of the Republic of China administration, serving as its wartime capital during the Second Sino-Japanese War. Its abbreviated name is derived from the old name of a part of the Jialing River that runs through Chongqing and feeds the Yangtze River.