At 133 meters high and 13 meters wide, Nachi-no-Otaki boasts the greatest drop of any one-tier waterfall in Japan. It has been worshipped since ancient times as a divine object of Kumano Nachi Taisha, and Hiro-jinja stands next to the waterfall basin. Also, the entire area surrounding the waterfall is protected as primeval forest of Nachi. The place for ascetic training by mountain monks who practice Shugendo, made up of large and small waterfalls known collectively as the 48 waterfalls of Nachi, is upstream.