Myōjinike Pond is situated on the eastern foot of Mt. Kasayama. It was created by the growth of a sandbank between the island which would become Mt. Kasayama and the mainland. The split did not fill completely with sand and the remaining body of water became Myōjinike Pond.

The lake consists of three parts: Ōike, Nakanoike and Okunoike. It is linked with the open sea through slits in the mass of lava, and its water level changes with the tide. This lake has been listed on the National Register of Natural Monuments.