Guida
Oniwa Park is a significant part of the Hida Kiso National Park, stretching from Mitake Town in Kani District to Mizunami City, Gifu Prefecture. The defining feature of this park is the collection of massive granite boulders and unique rock formations shaped by millions of years of erosion. These geological wonders are officially designated as a National Scenic Spot and a Natural Monument in Japan. The landscape offers a harmonious blend of the Kani River's upper reaches with vibrant seasonal vegetation, such as azaleas and colorful autumn maples.
The name "Oniwa" (meaning 'Ogre Rocks') is rooted in ancient Japanese folklore. Legend tells of an ogre named "Seki no Taro" who once inhabited this area. It is said that around the year 1200, this figure caused trouble for travelers on the Tosan-do highway until he was eventually defeated by soldiers sent by Emperor Go-Shirakawa. Throughout the park, many landmarks bear names related to this legend, such as "Oni no Iwaya" (Ogre's Cave), "Oni no Kubizuka" (Ogre's Head Mound), "Taro-iwa" (Taro Rock), and "Kubiarai-ike" (Neck-washing Pond).
The park offers diverse spots that showcase both geological and historical beauty. The most striking feature is the massive rock formations, which possess smooth, organic shapes that demonstrate the incredible power of natural sculpting. Near the summit of Eboshi-iwa, visitors may even witness a temporary waterfall under specific weather conditions, such as after heavy rain. The seasonal vegetation is also a highlight; the bright colors of spring azaleas and the deep hues of autumn leaves provide a stunning backdrop to the textured granite. Additionally, the "Rock Cave Crawl" (Iwaya-kuguri), once a famous local attraction, is still held as a special event during certain periods.
The scenery changes beautifully with the seasons. In spring, the landscape is adorned with blooming azaleas, while early summer brings lush greenery that wraps around the rocks. Autumn (around October to November) is particularly famous for its vibrant foliage, offering a striking contrast against the gray granite. If you wish to experience the "Rock Cave Crawl," please note that it is a limited-time event held approximately four days per month between April and November. It is highly recommended to check the schedule in advance. While daytime is best for observing textures and colors, certain phenomena like temporary waterfalls depend heavily on the weather.
Beyond observing the natural scenery, visitors can immerse themselves in local history. The "Rock Cave Crawl" provides a unique, tactile experience of moving through natural stone passages. This activity has gained popularity among those seeking a unique way to experience natural art. For further relaxation, the nearby Oniwa Onsen offers hot spring baths with mineral components such as hydrogen sulfide and uranium, making it an ideal way to conclude a day of nature walks and exploration.
The area surrounding the park is rich in natural beauty, characterized by the valleys formed by the Kani River. The landscape of water and stone is truly captivating. There are several hot spring facilities in the vicinity, so we recommend checking local accommodation and onsen information if you plan to stay overnight. The area is also steeped in history related to the ancient Tosan-do highway, offering many opportunities for historical exploration.
As the park features natural terrain with uneven surfaces and rocky slopes, please wear comfortable walking shoes and practical clothing. Since some local facilities and hot springs may require cash, it is wise to carry Japanese Yen. English signage is limited, so we recommend researching your route in advance. If you plan to participate in the Rock Cave Crawl event, please verify the specific dates beforehand. To preserve this natural environment, please follow all rules regarding waste disposal and respect the landscape.