Hakoishihama Site: A Sand-Dune Time Capsule of Ancient Sea Trade in Tango
On a windswept ribbon of sand stretching between the Sea of Japan and the inland Kumihama Bay, lies one of the most quietly extraordinary archaeological sites in western Japan. The Hakoishihama Site (Hakoishihama Ibutsu Hōganchi) is a vast National Historic Site spread across roughly 25 to 44 hectares of coastal dunes in the city of Kyotango, Kyoto Prefecture. Beneath its grasses, pine groves, and sliding sands rest layers of human life that span more than two thousand years—from Jōmon hunter-gatherers to medieval villagers—and a single startling discovery here in 1903 rewrote what historians thought they knew about Japan's earliest contacts with the Chinese mainland.
For travelers seeking to step beyond the famous temples of Kyoto and into the quieter, more elemental face of Japanese history, Hakoishihama offers a rare experience: a place where the deep past lies just beneath your feet, framed by ocean horizons and the rhythmic crash of waves on white sand.
What Is the Hakoishihama Site?
The Japanese term "ibutsu hōganchi" translates roughly as "artifact-bearing area"—a designation given to archaeological zones where ancient relics are known to lie embedded in the soil over a wide expanse, even where formal excavation has been limited. The Hakoishihama Site occupies a sandbar at the eastern base of the small peninsula that separates the Sea of Japan from Kumihama Bay, in the Minato-miya district of Kumihama-chō.
The protected zone measures roughly 800 metres east to west and 500 metres north to south, with the broader artifact-bearing area extending across nearly a full kilometre. The dunes are the product of ancient wind-blown sand layered over an old volcanic ash horizon from Mount Daisen, and they have acted both as a preservative and a concealer of the human story below.
A Site Spanning Thousands of Years
What makes Hakoishihama remarkable is the sheer chronological depth of human activity recorded here. Surface collections gathered since the late 19th century include pottery, tools, and ornaments from a striking range of periods.
- Jōmon period stone arrowheads and pottery sherds from the late Jōmon era
- Yayoi pottery from both the early and middle phases, with motifs suggesting cultural exchange with regions as distant as the Setouchi (Inland Sea) area
- Polished stone axes, stone swords, stone weights, magatama curved beads, and tube-shaped kudatama beads
- A box-shaped stone coffin from the Kofun period, found in 1918, containing Sue ware vessels and an extended-burial skeleton
- Hajiki and Sue ware ceramics, plus Heian-period coins of the "Twelve Imperial Coinages" series, including Fujū-shimpō and Jōgan-eihō
- Chinese ceramics and celadon fragments, along with iron slag pointing to small-scale metal working
The collector Inaba Takuzō, working from the late Meiji era, gave evocative names such as "Iron Mountain," "Shell Mound," "Doll Hill," and "Bone Mountain" to different zones of the dune where particular artifacts emerged. Those nicknames still echo through the academic literature today.
Why Was It Designated a National Historic Site?
In 1903, a discovery here electrified the young field of Japanese archaeology: two bronze coins known as "Kasen" were collected from the dunes. The Kasen was a coinage produced by the short-lived Xin Dynasty of the Chinese reformer Wang Mang, who reigned from 8 to 23 CE, with continued minting until around the year 40. Because the coin was minted for such a brief window of history, its presence on a beach in distant Tango carried profound implications.
It told scholars that during the late Yayoi period, the people of this coastal community were already in contact—directly or through intermediaries—with the great civilizations of the Asian mainland. The dunes of Hakoishihama were not a remote backwater but a node in a maritime network that linked the Japan Sea coast with the trading worlds of continental East Asia.
A second numismatic treasure deepens the story: a "Meitō" knife-shaped coin from the Spring and Autumn through Warring States period of ancient China, used in the states of Yan, Qi, and Zhongshan, is also reported to have come from this site. It is now kept at nearby Kamiya Shrine. On the strength of these and other discoveries, Hakoishihama was designated a National Historic Site on 3 March 1921 (Taishō 10), making it one of the earliest sites in Kyoto Prefecture to receive that protection.
Highlights for the Visiting Traveler
The Atmosphere of an Untamed Coast
Unlike a temple or castle, where architecture defines the experience, Hakoishihama rewards a slower kind of attention. The site is fundamentally a landscape—rolling sand dunes anchored by hardy black pines (kuromatsu) and creeping juniper (hainezu), with stretches of acacia planted in the 20th century as wind- and sand-breaks. A weathered stone marker bearing the inscription "Hakoishihama Ibutsu Hōganchi," erected in 1926, stands quietly on the dune and is the simplest physical confirmation that you have arrived.
One of Japan's Most Beautiful Coastlines
The black pine groves of this stretch are listed among the "100 Selected Sites of White Sand and Green Pines" in Japan, and the entire shoreline forms part of both the San'in Kaigan National Park and the UNESCO Global Geopark of the same name. Walking the sand here, one sees both archaeology and geology layered together: ancient soils, volcanic ash, drifting dunes, and the timeless geometry of the Sea of Japan.
The Story of the Discoverers
Hakoishihama is also a monument to the dawn of Japanese archaeology itself. Inaba Takuzō, a member of a prominent local landowning family, and Oda Ikujirō, the head of the Kumihama post office, gathered artifacts here from the 1880s onward. Oda even maintained a small private archaeological museum on the second floor of the post office. Their reports brought Hakoishihama to national attention well before the first formal excavations.
The Surrounding Area
Hakoishihama sits at the heart of the Kotenkyō ("Little Amanohashidate") region, a stretch of beauty that easily fills a one- or two-day visit.
- Kotenkyō and Kuzuno Beaches: Six kilometres of continuous white-sand beach, including some of the cleanest swimming waters in western Japan, selected among the "88 Best Bathing Beaches in Japan."
- Kuminohama Onsen: A hot spring resort area along Kumihama Bay, offering coastal bathhouses with views of the inlet and traditional ryokan inns.
- Kumihama Bay Cuisine: Famous in winter for snow crab (matsuba-gani) and oysters; in summer for fresh sashimi from the Sea of Japan.
- Inaba Family Residence: A historic merchant house associated with the very family that helped discover Hakoishihama, today preserved and open to visitors.
- San'in Kaigan UNESCO Global Geopark: Spectacular cliffs, sea-carved rocks, and sand-dune landscapes accessible along the coastal road.
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Q&A
- Is there a museum or visitor centre at the Hakoishihama Site itself?
- There is no on-site museum. The dunes themselves form the protected area, marked by a single stone pillar erected in 1926. Many of the artifacts collected here are housed in institutions such as the Kyoto University Museum and the Kyotango City Museum of Ancient History (Kodai-no-Sato Shiryōkan), where they have been featured in special exhibitions.
- What exactly are the Kasen coins, and why are they so important?
- The Kasen is a bronze coin issued under the Xin Dynasty of Wang Mang in the early first century CE. Its short minting period gives it a precise chronological signature, so its appearance in Yayoi-period contexts in Japan provides hard evidence of continental contact during that era. Two were discovered at Hakoishihama in 1903, and they were instrumental in the site's recognition as nationally significant.
- Can I see archaeological remains in person at the site?
- Most artifacts have been collected and are now in museum collections; the surface today is largely sand, vegetation, and pine. The experience is more contemplative than visually dramatic—an opportunity to stand on a landscape that has held human presence for millennia rather than to view exhibits. Please refrain from digging or removing any material from the protected area.
- When is the best time of year to visit?
- Late spring through early autumn is most pleasant for walking the coastline. Summer brings beach crowds at the adjacent Kotenkyō and Hakoishihama bathing beaches, while winter offers dramatic Sea of Japan storms and the famous local crab cuisine, though access to the dunes themselves can be cold and windy.
- How do I reach the site from Kyoto City?
- From Kyoto Station, take a JR limited express to Toyooka or Fukuchiyama, transferring to the Kyoto Tango Railway and alighting at Kotenkyō Station. From there, the dunes are about a 5-minute drive or a longer walk along the coast. Renting a car at one of the major Tango stations is the most flexible way to combine Hakoishihama with nearby attractions.
Basic Information
| Name | Hakoishihama Ibutsu Hōganchi (Hakoishihama Site) |
|---|---|
| Designation | National Historic Site (designated 3 March 1921) |
| Location | Minato-miya, Kumihama-chō, Kyotango City, Kyoto Prefecture |
| Designated Area | Approximately 66,396 square metres |
| Period | Jōmon through Muromachi (continuous occupation across millennia) |
| Notable Discoveries | Kasen coins of the Chinese Xin Dynasty; Meitō knife-shaped coin; Yayoi pottery; box-shaped stone coffin; Heian-era coins |
| Access | About 5 minutes by car from Kotenkyō Station on the Kyoto Tango Railway Miyatoyo Line |
| Admission | Free; the site is an outdoor protected area with no enclosure |
| Park Designation | Within the San'in Kaigan National Park and the San'in Kaigan UNESCO Global Geopark |
References
- 函石浜遺物包含地 - Wikipedia
- https://ja.wikipedia.org/wiki/函石浜遺物包含地
- デジタルミュージアムK13 史跡函石浜遺物包含地 - 京丹後市
- https://www.city.kyotango.lg.jp/top/soshiki/kyoikuiinkai/bunkazaihogo/3/1/2/3304.html
- 指定文化財（史跡）一覧 - 京丹後市
- https://www.city.kyotango.lg.jp/top/soshiki/kyoikuiinkai/bunkazaihogo/3/1/3336.html
- 箱石浜遺物包含地 - 山陰海岸ユネスコ世界ジオパーク
- https://sanin-geo.jp/play/spots/箱石浜遺物包含地/
- 函石浜遺跡 - コトバンク
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- 京都丹後・久美浜｜小天橋観光協会
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Last verified: 2026.05.10