Name

  • 大海積神

  • Ōumitsumi no Kami (common reading) / sometimes treated as closely related to Watatsumi

Identity

Ōumitsumi no Kami (大海積神) is a kami associated with the sea (umi, 海) and with its power, both life-giving and dangerous. Depending on the source and the shrine, this name is often presented as a variant designation (or a very close deity) of the great sea god also called Watatsumi (綿津見神 / 海神) or Ōwatatsumi (大綿津見神). In other words, we are within the same “family” of marine deities, with spellings and nuances that may differ locally.

Mythological role

The role is that of a protector of the ocean waters: symbolically governing the sea, currents, tides, and everything related to navigation and marine resources. People invoke this kami for safe voyages, protection from storms, and prosperity connected to fishing and coastal activities.

Famous myth

This deity is generally linked to major narratives where the sea is an “other world” and a divine realm. Around these sea kami, traditions often include visits to an undersea kingdom (a “palace of the sea”) and exchanges between the human world and the ocean domain. Depending on the version, the story is told under the name Watatsumi/Ōwatatsumi rather than 大海積神, but the imagery and function remain the same: the sea as a sovereign power, able to help, to test, and to restore order.

Worship

Worship is mainly found at shrines near the coast, or those connected to maritime work and sea routes. Typical prayers include:

  • safety at sea (navigation, fishing, storms),

  • protection of travel and sea crossings,

  • prosperity in maritime activities (catches, trade, ports),

  • calming dangers related to water.

Symbolism

Ōumitsumi no Kami symbolizes the sea as a source of life (food, routes, exchange) and as an untamable force (storms, depth, unpredictability). It is naturally associated with respect for the ocean: gratitude for its gifts, and caution toward its power.

Note: “Aliases / spellings”

  • Watatsumi (綿津見神 / 海神): a very common term meaning “sea god.” Depending on the source, it is either the main name or a generic label.

  • Ōwatatsumi (大綿津見神): an “emphatic” form with Ō- (“great”), often used for the sovereign great kami of the ocean.

  • Ōumitsumi (大海積神): another spelling found in certain traditions/shrines. It refers to the same sphere of marine deities and can be understood as a variant designation (or local form) of the sea god.

Reading tip for visitors: if you see 綿津見 / 海神 / 大綿津見 / 大海積, think “Watatsumi = sea deity/deities,” with the spelling varying by place and document.