The purpose of this study was to investigate the flora and vegetation in 10 regions of the Hwang River during four seasons. For example, Survey Region 1 consisted of 255 taxa, which included 76 families, 221 species, 33 varieties, and 1 form. Naturalized plants of this region consisted of 18 species and 9 families, whereas approximately 14 species of aquatic plants have been identified. The flora of the Hwang River consisted of 492 taxa, including 99 families, 273 genera, 426 species, 65 varieties, and 1 form. Aquatic plants belonged to 15 families, 26 genera, and 50 species. Eight and 18 plant species were classified as Degree III and Degree I, respectively. The flora of the Hwang River did not represent specific floristic plants. Degree III and Degree I southern plants were predominantly distributed across sub-regions of the Hwang River.