Owatatsumi no Mikoto is a Shinto deity of the sea, revered as a guardian spirit of the ocean and its creatures in Japanese mythology. Traditionally associated with fishing communities, this deity is honored for the sea's role in sustaining maritime life and livelihoods. Owatatsumi appears in classical texts such as the Kojiki and Nihon Shoki, where the sea kami's realm is portrayed as a vast underwater domain connected to other deities of Japan's origin myths.