Known for the Oga no Namahage ogres, Oga Peninsula has many place names related to ogres. Oni no Kakurezato (Hidden Ogre Village)Rocks is a pyramid-shaped formation of large rocks, which gained its name from the myth that ogres secretly lived in a rocky mountain they made by piling stones on top of each other. In reality, it is thought to have been created through volcanic activity in which viscous lava was pushed up from underground, forming pillars, which then crumbled.
