Inome Cave is a sea-eroded cave facing Inome Bay in Izumo City, Shimane Prefecture. Located on the northern coast of the Shimane Peninsula, the cave has been shaped over countless years by the powerful waves of the Sea of Japan.
Inome Cave is particularly fascinating because of its connection to ancient Japanese mythology, history, and archaeology. It is traditionally believed to be the “Cave of Yomi” mentioned in the ancient Izumo Fudoki, leading to the enduring legend that this mysterious cave was connected to the world of the living and the realm of the dead.
Combined with its dramatic coastal landscape, this connection with the mythology of Izumo gives Inome Cave a unique atmosphere and makes it an intriguing destination for travelers interested in Japan’s ancient culture.
Inome Cave is a large sea cave measuring approximately 30 meters across and extending about 30 to 50 meters deep.
The cave was formed in layers of green tuff, volcanic rock created from deposits produced by volcanic activity. This type of geology is characteristic of parts of the Sea of Japan coast, and the area around Inome Cave has been recognized as a geosite within the Shimane Peninsula–Lake Shinji–Lake Nakaumi Geopark.
The cave entrance is said to resemble the eye of a wild boar when viewed from certain angles. This is traditionally considered the origin of the name “Inome,” meaning “wild boar’s eye.”
Rugged cliffs and the deep blue waters of the Sea of Japan surround the cave. Inside, the sound of the waves echoes through the darkness, creating an atmospheric setting that can easily stir the imagination of visitors.
The ancient Izumo Fudoki, compiled in 733, contains a reference to a place called “Yomi no Ana,” or the “Cave of Yomi.”
In Japanese mythology, Yomi is the realm of the dead. It is associated with the story of Izanagi-no-Mikoto, who journeyed to the underworld in search of his deceased wife, Izanami-no-Mikoto.
Inome Cave is traditionally identified with this legendary cave, although the identification is a matter of local tradition rather than a proven historical fact. For centuries, the cave has nevertheless been regarded with a sense of awe because of its connection with the ancient stories of Izumo.
The dark interior, echoing waves, and isolated coastal setting make it easy to understand why such a place could have been regarded as sacred by people in ancient times. Today, its mysterious atmosphere continues to attract visitors interested in mythology and spiritual traditions.
Inome Cave gained national attention following an archaeological investigation conducted during improvements to the local fishing harbor in 1948.
Large numbers of artifacts and human remains were discovered inside the cave, leading to a full-scale archaeological investigation. The discoveries revealed evidence of human activity and burial practices extending from the Jomon period to the Kofun period.
Artifacts discovered at the site include human remains, pottery, wooden objects, iron tools, fish bones, animal bones, and shells. Together, they provide valuable clues about the lives, beliefs, and burial customs of ancient communities in the region.
In 1957, the site was designated a National Historic Site of Japan as the “Inome Cave Artifact Deposit Layer.”
One particularly notable discovery was a human skeleton wearing a bracelet made from Gohoura shell, a large marine shell originating from the southern seas.
The presence of this material is significant because it suggests that people in ancient Izumo had connections with distant regions. Long before modern transportation, marine routes connected communities around Japan, and objects such as this shell bracelet provide tangible evidence of these exchanges.
The discovery helps illustrate how ancient Izumo was connected to a much wider world through the sea.
Among the discoveries at Inome Cave was a male skeleton dating from the late Yayoi period. The body had been placed in a flexed supine burial position together with pottery, and a bracelet made from Gohoura shell was found on the right arm.
Archaeologists also identified a distinctive burial practice believed to date from the Kofun period, in which the deceased was covered with a dugout canoe.
These discoveries have led to the interpretation that Inome Cave may have served as a burial site for people whose lives were closely connected with the sea.
The site therefore offers an important glimpse into the culture and beliefs of ancient communities who lived along the Sea of Japan and relied on maritime networks for their livelihoods and long-distance exchange.
Many of the artifacts excavated from Inome Cave have been designated as cultural properties of Shimane Prefecture. They are preserved and displayed at the Izumo Yayoi-no-Mori Museum.
Visitors to the museum can see archaeological materials including pottery and wooden objects, as well as exhibits explaining the human remains and discoveries from the cave. Visiting the museum together with Inome Cave provides a more complete understanding of the site’s archaeological significance.
The interior of the cave has an uneven and potentially hazardous surface. There is also a risk of rocks or small stones falling from the ceiling.
Visitors should exercise extreme caution and wear shoes with good grip. Depending on conditions, access to parts of the cave may be restricted for safety reasons. Always follow local signs and instructions when visiting.
Several places associated with ancient beliefs and traditions can be found around Inome Cave. One of the most distinctive is Karakama Shrine, an ancient shrine dedicated to Susanoo-no-Mikoto.
Karakama Shrine is recorded in both the Izumo Fudoki and the Engishiki Jinmyocho, reflecting its long history as a sacred site. Locals affectionately call it “Kankama-san.”
Reaching the main sanctuary requires climbing approximately 300 steep stone steps and then passing through a narrow gap between enormous rocks, only about 45 centimeters wide. This challenging approach has given the shrine a reputation as a mysterious place that cannot be reached easily.
The name “Karakama” is also associated with traditions concerning ancient metalworking. Local legends connect Susanoo-no-Mikoto with the transmission of ironworking culture from the Korean Peninsula to Japan.
Another nearby attraction is Uppurui Wind Turbine Park. Uppurui is an unusual Japanese place name written as 十六島 but pronounced “Uppurui.” The area is located on a beautiful cape extending into the Sea of Japan.
The park is home to 26 enormous wind turbines, creating a striking contrast between modern renewable-energy facilities and the rugged coastal landscape.
A walking path provides views across the wind turbines and the Sea of Japan, and on clear days, visitors may be able to see the distant Izumo Hinomisaki Lighthouse.
The surrounding coastal waters are also famous for Uppurui nori, a rare rock seaweed harvested by hand during the winter. It is a traditional ingredient closely associated with the food culture of the Izumo region.
Another important historical site in the area is Wanibuchi-ji Temple, a historic Tendai Buddhist temple traditionally said to have been founded in 594.
The temple flourished as a sacred site associated with mountain asceticism and is surrounded by peaceful forests. It is also famous for the tradition that Musashibo Benkei, the legendary warrior monk, trained here during his youth.
Wanibuchi-ji is particularly popular during autumn, when the temple grounds are surrounded by brilliant red foliage. The combination of history, legends, and mountain scenery offers another perspective on the cultural heritage of the Izumo region.
Inome Cave is far more than a natural sea cave. Its dramatic coastal landscape, ancient mythology, archaeological discoveries, and geological features come together to create a destination unlike many other places in Japan.
The legend of the “Cave of Yomi” connects the site with the mysterious world of Japanese mythology, while the archaeological discoveries reveal how people lived and were buried here thousands of years ago.
The human remains, ancient pottery, wooden artifacts, iron objects, and shell ornaments also demonstrate that ancient communities in Izumo were connected to distant regions through the sea.
For travelers who want to explore the deeper layers of Izumo’s mythology, history, archaeology, and natural landscapes beyond the famous sites around Izumo Taisha, Inome Cave offers a fascinating journey into a much older world.