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The word "江南" is formed by directly combining the character 江, meaning "river" (specifically the Yangtze River in this context), with the character 南, meaning "south", to create a compound term that literally translates to "south of the river", used to denote the geographic region south of the Yangtze River.
Word Definition - 江南
south of Changjiang or Yangtze river; south of the lower reaches of Changjiang; often refers to south Jiangsu, south Anhui and north Zhejiang provinces; a province during Qing times; in literature, refers to the sunny south; Gangnam (district in Seoul, South Korea)