Oyamatsumi-no-mikoto is a kami of mountains in Japanese Shinto tradition, revered as an ancestral deity governing mountainous terrain and the natural forces associated with it. According to the Kojiki and Nihon Shoki, this deity is considered the father of several other significant kami, including Konohanasakuya-hime, and is enshrined at Oyamazumi Shrine on Omishima Island. Oyamatsumi-no-mikoto is traditionally honored by those seeking harmony with mountains, forests, and the broader natural environment.