Iwakura rock

Iwakura (岩倉) refers to the belief in rocks as Yorishiro containing Kami in ancient Shinto.

There is also mention of another rock-related object called Iwasaka, which is believed to be a ritual site centered on a rock.

Some of the megaliths along the Kaido have Buddhism carved on them, and some have Legends attached to them, such as the famous samurai who connected Horses.

There is a research group (Iwakura Gakkai) that claims that the belief in rock formations and megaliths, including these, can be traced back to the Jōmon period, and that there are also artificially arranged rock formations, and that their arrangement represents certain figures, directions, or the shape of the Constellation.

[2] An iwasaka (磐境) is a stone altar or mound erected as a yorishiro to call a kami for worship.