Changshou.

Changshou District stands on the Yangtze eighty kilometres downstream of the Yuzhong district of downtown Chongqing, in low hills at the southern end of the basin's eastern parallel ridge-and-valley belt. A county has been recorded here for 2,300 years: a Zhi county in 316 BC, renamed Jiangzhou in 226 AD, Lewen in 519, and Changshou county in 1362. It became a Chongqing district in 2002. The economy rests on chemicals, steel and machinery, and the district is described as the country's largest natural gas chemical base; beside the river lies Lake Changshou, a man-made water of sixty square kilometres.