Shikaumi Shrine — 志賀海神社

Shikaumi Shrine sits on Shikanoshima, a small island in Hakata Bay connected to Fukuoka by a narrow sandbar. This is the ancestral shrine of the Azumi clan, an ancient maritime people who controlled the sea routes between Kyushu and the Korean peninsula before the formation of the centralized Japanese state. The shrine claims to be the original seat of all Watatsumi worship in Japan — the veneration of the three gods of the sea. Its priests still perform the Ayasugi Dance, a ritual unchanged since the Heian period, in which they circle the altar wearing tall conical hats and chanting in a pre-classical Japanese that even specialists struggle to parse. The shrine faces the ocean across a pine grove, and its founding is lost in the centuries before written records.

The Azumi clan established worship at this site sometime before the 3rd century CE, making Shikaumi one of the oldest continuously maintained shrines in Japan. The clan’s name appears in the Kojiki and Nihon Shoki as descendants of the sea god Watatsumi, tasked with protecting the imperial line through naval power. They controlled the Genkai Sea and acted as intermediaries in early diplomatic and trade missions to the Korean kingdoms of Silla and Baekje. The shrine’s current structures date primarily to the early Edo period, but the ritual calendar and priestly lineage stretch back without interruption to the pre-Nara era. Shikaumi was designated an Important Cultural Property in recognition of its architectural integrity and its preservation of ancient maritime ritual forms.

Watatsumi no Mikoto — specifically the three aspects known as Sokotsuwatatsumi (Bottom Sea God), Nakatsuwatatsumi (Middle Sea God), and Uwatsuwatatsumi (Surface Sea God) — are enshrined here as the primordial deities of the ocean. These gods control tides, currents, and the safe passage of ships. In mythology, they are the fathers of Toyotama-hime, who married the grandson of the sun goddess and gave birth to the first emperor’s father, making them direct ancestors of the imperial line. The shrine also venerates the spirits of the Azumi ancestors, who served as hereditary priests and naval commanders. The messenger animal is the turtle, symbol of longevity and deep-sea wisdom.

The shrine’s central legend involves the imperial regalia. According to the Nihon Shoki, when Empress Jingū prepared to invade the Korean peninsula in the 3rd century, she came to Shikaumi Shrine to seek the blessing of the sea gods. The Azumi priests gave her two sacred jewels: the Shio-mitsutama (Tide-Flowing Jewel) and the Shio-hirutama (Tide-Ebbing Jewel). With these, she could command the ocean itself. During the invasion, she threw the Tide-Flowing Jewel into the sea, causing a great wave that carried her fleet to Korea and drowned the opposing army. On the return voyage, she used the Tide-Ebbing Jewel to calm the waters. The jewels were said to be returned to Shikaumi after her victory, though their current location remains one of Shinto’s enduring mysteries. The shrine preserves a stone marker where Jingū is said to have stood when receiving the jewels.

The main shrine buildings follow the nagare-zukuri style with sweeping cypress-bark roofs, rebuilt in 1619 during the early Edo period. The approach passes through a tunnel of ancient pines planted by Azumi priests over centuries, their roots holding the sandy soil against typhoon winds. Behind the main hall stands the Shioya Shrine, a smaller structure dedicated to the salt-making deity, reflecting the Azumi clan’s monopoly on salt production in northern Kyushu. The shrine grounds contain over 300 stone anchors, some dating to the Yayoi period, offered by fishermen and sailors across two millennia. At the northern edge of the compound sits the Kinpeki Shrine, which venerates a golden rock said to have fallen from the heavens during the age of the gods.

• Ayasugi Dance (January 15, October 15) — The most important ritual, performed by male priests wearing tall black hats called ayasugi. They circle the altar seven times while chanting in archaic Japanese, reenacting the sea gods’ blessing of the Azumi clan. The dance has been performed without interruption since the Heian period.
• Yamahome Festival (April) — A mountain-sea ritual unique to Shikaumi, in which priests carry sacred objects from the shrine to the summit of Mount Shika, then return them to the ocean’s edge, symbolizing the cycle of water.
• Shio-mitsusai (Tide Festival, June) — Commemorates the giving of the tide jewels to Empress Jingū, with offerings of salt and seaweed made at dawn when the tide is lowest.

October, during the autumn Ayasugi Dance. The weather is clear, the typhoon season has passed, and the ritual takes place outdoors under the pine trees with the bay visible in the background. Arrive the day before and walk the island’s circumference — a seven-kilometer loop that passes fishing villages, shell middens, and the ruins of wartime fortifications. The shrine is least crowded on weekday mornings in winter, when frost covers the stone anchors and the only sound is the wind through the pines.