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Strictly speaking Chongqing is not a province but a municipality but it has the same political status as a province. Located on the edge of the Yungui Plateau, Chongqing is intersected by the Jialing River and the upper reaches of the Yangtze. It contains Daba Shan in the north, Wu Shan in the east, Wuling Shan in the southeast, and Dalou Mountain to the south. The city is very hilly and is the only major metropolitan area in China without significant numbers of bicycles.

Chongqing is the largest and most populous of the People's Republic of China's four provincial-level municipalities, and the only one in the less densely populated western region of China. Formerly (until 14 March 1997) a sub-provincial city within Sichuan Province, the municipality of Chongqing has a registered population of 31,442,300 (2005). The boundaries of Chongqing municipality reach much further into the city's hinterland than the boundaries of the other three provincial level municipalities (Beijing, Shanghai and Tianjin), and much of the municipality, which spans over 80 000 km², is rural. The population of the urban area of Chongqing proper was 5.09 million (2000)[2].

The municipal abbreviation, (Yú), was approved by the State Council on 18 April 1997. Chongqing was also a municipality of the old Republic of China. 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.