When it comes to the history and culture of Sanxia, the contents always revolve around Sanxia River., which is not only the origin of culture but also the life of Sanxia. Sanxia River and Dahan River converge, and the confluence forms the main basin of four areas, including Tucheng, Shulin, Sanxia and Ganyuan. During the days when road traffic was underdeveloped, all commercial ships carrying staple merchandise depended on this
river for transportation. Approximately 30-40% of water supplied by Banxin Water Plant came from Sanxia River, which was also the source of daily drinking water for the inhabitants. However, most of the garbage in the river came from domestic life, local tourists and upstream. Although trash fees have been collected with the bags, tourists and inhabitants have not developed such concept and actions, so numerous trashes are disposed causally into the river.