Kojindani Historic Park is a large historical park in Hikawa-cho, Izumo City, Shimane Prefecture. The park was developed around the Kojindani Ruins, one of Japan’s most important archaeological sites from the Yayoi period, which dates back roughly 2,000 years.
The park was created to preserve the historic landscape of ancient Izumo and pass its cultural heritage on to future generations. It opened in May 1995 and covers approximately 27.5 hectares.
Visitors can explore the archaeological site, museum, reconstructed ancient dwellings, agricultural experience areas, walking trails, and natural landscapes. The park offers an enjoyable way for both adults and children to discover the history and culture of ancient Izumo while spending time outdoors.
Kojindani Historic Park is divided into northern and southern areas around Saiko Pond. Each area offers a different experience.
The northern area focuses on the Kojindani Ruins and museum, while the southern area features reconstructed dwellings, agricultural activities, and areas for enjoying nature.
Entering the park from the north parking area, visitors will first see the Kojindani Museum. Beyond the museum is a reconstructed ancient agricultural field covering approximately 5,000 square meters.
From around mid-June, approximately 50,000 ancient lotus flowers, known as Oga lotus, bloom across the fields. Their large, pale pink flowers create a beautiful summer landscape and attract many visitors and photography enthusiasts.
A walking trail known as the Ancient Path runs beside the agricultural fields and leads toward the archaeological site where the bronze artifacts were discovered.
At the excavation site, visitors can see a reconstruction of how the bronze artifacts were buried. A replica shows how the remarkable collection of 358 bronze swords was carefully arranged underground.
A slightly elevated viewing area provides a broader view of the archaeological site. Volunteer guides may also be available to explain the history of the ruins and the circumstances surrounding their discovery.
The Kojindani Ruins are the heart of the historic park and are considered extremely important in the study of Japanese archaeology.
In 1984, an archaeological investigation connected with the construction of an agricultural road uncovered 358 bronze swords dating from the Yayoi period. At the time, only around 300 bronze swords had been discovered in total across Japan. Finding more than that number at a single site was an extraordinary discovery that attracted attention throughout the country.
The following year, another excavation approximately 7 meters from the bronze swords uncovered 6 bronze bells and 16 bronze spearheads.
This was the first known archaeological site in Japan where these three types of bronze artifacts—bronze swords, bronze bells, and bronze spearheads—were found together. The discovery greatly advanced research into the history and culture of ancient Izumo.
All of the bronze artifacts discovered at Kojindani are designated as National Treasures of Japan, making the site an exceptionally valuable resource for understanding Yayoi-period culture.
The southern area of the park contains reconstructed pit dwellings based on houses from the Yayoi period. These buildings provide an easy-to-understand glimpse into how people lived approximately 2,000 years ago.
Visitors can examine the interior structure and imagine the daily lives of the people who lived in ancient Izumo. The reconstructed houses are also used for educational activities and are popular with families and school groups.
The park also includes a reconstructed ancient rice field where varieties of ancient rice, including black rice and red rice, are cultivated.
Seasonal activities such as rice planting and harvesting allow visitors to experience aspects of Yayoi-period agriculture. In winter, events such as traditional rice-cake making may also be held using rice harvested from the fields.
These hands-on experiences offer a unique opportunity to learn about ancient agricultural culture while connecting with local traditions.
The park’s Camellia Forest is particularly attractive in spring, when numerous varieties of camellias bloom among the greenery.
Red, white, and pink flowers add vivid color to the natural landscape, making this a pleasant area for a leisurely walk.
A grassy area surrounded by woodland contains barbecue facilities where visitors can enjoy an outdoor meal in a natural setting.
The area is especially popular with families and groups of friends from spring through autumn, offering a relaxing way to combine sightseeing with time outdoors.
Walking trails extend throughout the spacious park, allowing visitors to enjoy hiking and observing the surrounding plants and wildlife.
Each season brings a different atmosphere, from fresh green foliage in spring and the ancient lotus flowers of summer to colorful autumn leaves and the quiet landscape of winter.
Located within the historic park, the Kojindani Museum opened in 2005. Built next to the archaeological site, it functions as a site museum, introducing the history of the Kojindani Ruins and the remarkable artifacts discovered there.
The permanent exhibition includes replicas of the bronze swords, bronze bells, and bronze spearheads excavated from the site.
A full-scale diorama recreates the way the bronze artifacts were buried, allowing visitors to visualize the excavation scene and understand the remarkable nature of the discovery.
The museum also screens a documentary film about the excavation, giving visitors a vivid introduction to the discovery and the archaeological investigations that followed.
Special exhibitions of the Kojindani bronze artifacts are held around July 12, the date associated with the discovery of the bronze swords.
During these special “homecoming” exhibitions, National Treasure bronze artifacts normally kept at other museums are brought back to Kojindani and displayed near the place where they were originally discovered. This makes the exhibitions a particularly valuable opportunity for visitors interested in ancient Japanese history.
The temporary exhibition gallery presents special and seasonal exhibitions related to the Kojindani Ruins and the history of ancient Izumo.
At other times, displays introduce archaeological materials from surrounding sites, providing a broader look at the history and culture of the Izumo region.
The museum shop, Izumo no Harusato-ten, sells books about archaeology and ancient Japanese history, as well as original Kojindani merchandise, ancient-lotus-themed products, and locally made crafts.
It is a convenient place to find souvenirs connected with the history and archaeological heritage of Izumo.
The museum also has a community learning room used for lectures, seminars, hands-on educational programs, and other events.
When no event is taking place, the room can be used as a rest area. Windows offer views of the park, allowing visitors to enjoy its changing scenery throughout the seasons.
Kojindani Historic Park is a unique destination where archaeology, history, culture, and nature come together. Centered on the Kojindani Ruins, the park allows visitors to explore one of the most important archaeological discoveries connected with ancient Izumo.
The discovery of hundreds of bronze artifacts dramatically expanded our understanding of the Yayoi period and provided important archaeological evidence for the history of the Izumo region, which had long been closely associated with Japanese mythology.
Walking through the spacious park, visiting the archaeological site, and exploring the museum offers a chance to imagine life in Japan approximately 2,000 years ago.
Whether you are fascinated by archaeology, traveling with children, or simply looking for a peaceful place to enjoy nature, Kojindani Historic Park offers a memorable way to experience the ancient world of Izumo.