Meoto Iwa, or Married Couple Rocks, are a kind of rock formation seen as religiously significant in Shinto. They are a subtype of Iwakura rock.
According to Shinto, the rocks represent the union of the creator kami, Izanagi and Izanami. The rocks, therefore, celebrate the union in marriage of man and woman.
The most famous pair is the pair at Futami Okitama Shrine in Futami-ura, two rocky stacks off the coast from Ise, Mie, Japan. They are joined by a shimenawa (a heavy rope of rice straw) and are considered sacred by worshippers of the shrine. The shimenawa, composed of five separate strands which each weigh 40 kilograms, must be replaced several times a year in a special ceremony. The larger rock, said to be male, has a small torii at its peak.At dawn during the summer, the sun appears to rise between the two rocks. Mount Fuji is visible in the distance. At low tide, the rocks are not separated by water.
Okitama Shrine is dedicated to Sarutahiko Ōkami and imperial food goddess Ukanomitama. There are numerous statues of frogs around the shrine. The shrine and the two rocks are near the Grand Shrine of Ise, the most important location of purification in Shinto.
The couple rocks at Futami Okitama Shrine in Mie Prefecture Ise City have been known for a long time, as depicted by Ukiyo-e artist in the Edo period, and are generally used as a symbol and prayer for "marital bliss and domestic safety", "maritime security and great catch". It is also a symbol and prayer for "marital bliss and domestic safety", "maritime security and a good catch of fish", and is said to be a symbol of Iwakura Shinko in Kojindo, which means a symbolic place or object in Nature, especially megaliths, rocks, and mountains, were considered Shintais and believed to be places where Kamis resided. For this reason, shimenawas and toriis were decorated as proof that a deity resided there (kanzumaru).