To what area does 江南 refer?
Wikipedia describes Jiangnan as:

Jiangnan or Jiang Nan (Chinese: 江南; pinyin: Jiāngnán; formerly romanized Kiang-nan, literally &quot;South of the River&quot; meaning &quot;South of the Yangtze&quot;) is a geographic area in China referring to lands immediately to the south of the lower reaches of the Yangtze River, including the southern part of its delta. The region encompasses the city of Shanghai, the southern part of Jiangsu Province, the southeastern part of Anhui Province, the northern part of Jiangxi Province and the northern part of Zhejiang Province. The most important cities in the area include Anqing, Changzhou, Hangzhou, Nanjing, Ningbo, Shaoxing, Suzhou, Wuxi, Wenzhou, and Zhenjiang.