Sai no Narutaki
"These rapids is located on the Hidaka River. While called a waterfall, there is almost no falling waterfall, instead this section of the river consists of a series of beautiful rock formations and countless boulders standing amidst raging rapids. There is an open space along the Hidaka River where you can see Sai-no-Narutaki Falls, and there is an explanatory board with excerpts of the original text of the novel ""The River Hidaka"" by Sawako Ariyoshi, a Japanese literary writer from Wakayama Prefecture. It is known as a dangerous spot for rafting that was popular for transporting wood downstream. There is a suspension bridge nearby from where you can see the raging river below."