八岐大蛇
According to the Kojiki, Mount Sentsū is the scene of the legendary battle between Susanoo and Yamata no Orochi. Yamata no Orochi, an 8-headed and 8-tailed Japanese dragon, tormented residents of the Izumo area. Susanoo, the Shinto god of the sea and storms, slew Yamata no Orochi at the foot of Mount Sentsū, and his blood flowed into the Hi River (today known as Hii River). Yamata no Orochi's corpse produced Kusanagi-no-Tsurugi, a Japanese sword and one of three Imperial Regalia of Japan that legitimate the rule of the Emperor. Susanoo then presented the sword to his sister, the Sun Goddess Amaterasu, who passed it to her descendants, the Imperial family of Japan.