Guide
Oniwa Park is a part of the Hida Kiso National Park, located spanning the area from Mitake Town in Kani District to Mizunami City in Gifu Prefecture. The park's most striking feature is the collection of massive granite boulders and unique rock formations created through millions of years of erosion. These geological wonders are officially designated as a National Scenic Spot and a Natural Monument of Japan. The landscape offers a harmonious blend of rugged rock structures and lush vegetation, including flora found near the headwaters of the Kani River, such as azaleas and maple trees.
The name "Oniwa" (meaning "Ogre Rock") is rooted in ancient legends. Local folklore tells of a legendary figure named "Seki no Taro," an ogre who once inhabited this land. It is said that around the year 1200, Seki no Taro caused trouble for travelers passing through the Tōsandō (the ancient highway), until he was eventually defeated by soldiers acting under the orders of Emperor Shirakawa. Throughout the park, many landmarks bear names related to this legend, such as "Oni no Iwaya" (Ogre's Cave), "Oni no Kubozuka" (Ogre's Head Mound), "Taro Rock," "Manaita Rock" (Cutting Board Rock), and "Kubiarai Pond" (Neck-washing Pond).
The park offers diverse sites that showcase both geological and historical fascination. The primary draw is the massive rock formations, which possess smooth, organic shapes that demonstrate the incredible power of natural erosion. Near the summit of Eboshiwa Rock, visitors may even witness a temporary waterfall under specific weather conditions, such as after heavy rainfall. The seasonal changes are also a major highlight: the contrast between the textured granite and the vibrant colors of spring azaleas or autumn maple leaves is truly spectacular. Additionally, the "Rock Cave Crawl" (Iwaya Kuguri), once a famous local attraction, is still held as a special event during specific periods.
The scenery changes beautifully with the seasons. In spring, the landscape is adorned with blooming azaleas, while early summer brings a lush green canopy. Autumn (around October to November) is a peak season for viewing autumn foliage, offering a stunning color contrast against the gray rocks. If you wish to experience the "Rock Cave Crawl," please note that it is a limited-time event held only about four days per month from April to November. While daytime is best for observing the fine textures of the rocks, please check local weather forecasts if you are hoping to see the temporary waterfalls.
Visitors can enjoy a deep connection with nature and local history at Oniwa Park. The