Onogoroshima

Onogoroshima (Japanese: 淤能碁呂島, literally meaning "Self-forming Island") was a mythical island as part of the Japanese creation mythology. It is found in the record of the Kojiki. It is also sometimes known as Onogoro Island, Onokoro Island, Onogoroshima, or Onokoroshima.

In Mythology
The Island of Onogoroshima was formed when Izanagi and Izanami churned the primeval sea with the Heavenly Spear. When the spear was raised, the drops of salt water from it formed this island, the first land to be created.

The couple built a great palace here supported by a Pillar of Heaven, where they were wed. This island is where Hiruko was conceived.