This strange rock located in Kozagawa-cho is a nationally designated Natural Treasure. In the midstream of the Koza River with a total length of 56 km, which runs into the Kumanonada Sea and is known for its clear water, there are beautiful gorges formed by natural processes, which can be called the “figurative art created by nature.” One of them is the Kozagawa Gorge, located between Shichikawa Dam and the downstream. Along the gorge continuously stand strange rocks, each of which has a name according to its shape such as Ichimaiiwa (a monolith), Shojo-mine (a girl’s peak), and Mushikuiiwa Rock (worm-eaten rock). Mushikuiiwa Rock has numerous holes created by natural erosion, looking like a beehive. It is a worth-seeing art work made by nature. Kozagawa Gorge is one of the most famous cherry blossom viewing spots in the prefecture. In spring, a lot of people come to enjoy cherry blossoms while looking around the strange rocks.
- Aise, Kozagawa-cho, Higashi-muro-gun, Wakayama Prefecture 649-4235
- Mushikuiiwa Rock