At the foot of Mt. Kagamiyama, one of the Tamatsushima tidal island, there is a littoral cave, where Shiotsuchi-no-Oji, the god of tides, salt production, pregnancy and smooth delivery, is enshrined. The cave was once called "Koshi-no-Iwaya" (lit. Cave of Portable Shrine), due to an annual Shinto ritual which used to be celebrated at Niutsuhime Shrine, located at the upper reaches of the Kino-kawa River. In the ritual, a procession with a mikoshi (portable shrine) starting at Niutsuhime Shrine marched to the cave, where it was placed temporarily. The landscape of Rocky Mt. Kagamiyama, composed mainly of crystalline schist with ocean waves lapping onto its shore, has been praised as one of the Ten Sites of Scenic Beauty in Wakanoura.