Deep in the forested mountains of the interior of Dogo, the largest of the Oki Islands, are Dangyo Shrine and its pair of waterfalls. Just outside the torii are a pair of huge, ancient trees. The story is that when Izumo Taisha was being rebuilt the shrine was ordered to supply any such trees for timbers for the construction. The local people moved the torii forward some meters so that the trees then fell outside the shrine grounds and so were spared the felling.
There are two waterfalls here. The smaller is considered female and the larger male. With Japan's obsession with ranking, the waters here are ranked one of the 100 Best Waters of Japan. The water from the female waterfall is considered "winners" water, and is drunk by competitors in human nad bull sumo tournaments.
a couple of small shrines are inside the overhang over which the male waterfall cascades. The male kami here is Oyamakui, an Izumo kami who is famously enshrined at Hie Taisha below Enryakuji. The female kami is Seoritsuhime, not a well known kami but said to be the kami of waterfalls, rapids etc.
Bronze mirrors and other artifacts have been excavated here suggesting that this has been a sacred site since prehistory. Well worth the effort needed to visit, as are all the Oki Islands.