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The Kaneda Castle Ruins, located in Kurose, Mitsushima-cho, Tsushima City, Nagasaki Prefecture, is an ancient mountain fortress designated as a Special Historic Site of Japan. Built around the mid-7th century, this site is a representative example of a "Korean-style mountain castle," which served as a frontline defense against the Korean Peninsula. The fortress was skillfully constructed using the steep natural terrain of Mt. Jyo, preserving the ancient defensive structure alongside its surrounding landscape. A standout feature is its sophisticated stone walls (sekirui), which distinguish it from many other ancient mountain fortresses.
The history of Kaneda Castle dates back to the 6th year of Emperor Tenji (667 AD) during the Asuka period. Following the defeat at the Battle of Baekgang, it was established as a crucial strategic point to strengthen defense against the Korean Peninsula. Its significance is recorded in the "Nihon Shoki" (Records of Japan), making it an invaluable historical resource for understanding the deployment of soldiers (sakimori) and ancient defense systems. While parts of the site were affected by the construction of the Mt. Jyo artillery battery during the Meiji era, the precious remains are still well-preserved today.
The greatest attraction of Kaneda Castle is its stone walls, which stretch approximately 2.8 kilometers. While many ancient fortresses rely on earthen embankments, Kaneda Castle features highly sophisticated stone masonry throughout most of its perimeter. The walls vary in height from 2 to 6 meters, meticulously following the natural topography. Other notable features include the ruins of castle gates (such as Nino-jo Gate) and "chi" (protruding structures) designed to enhance defensive capabilities. From the summit of Mt. J， (276m), visitors can look out toward the Korean Peninsula, a view that underscores the strategic importance of this location.
The site is open year-round and can be visited in any season. Spring and autumn are particularly pleasant for hiking due to the mild weather and beautiful scenery. During summer, it is essential to carry plenty of water and wear sun protection, as there is little shade. For the best experience, visit on a clear, sunny day to enjoy the grand view of the Korean Peninsula from the summit.
The primary activity here is trekking through historical ruins. Visitors can follow paths that were once military roads during the Meiji era, walking through the remnants of ancient walls and gates. It is a deeply intellectual hiking experience that allows you to feel the breath of history while surrounded by rich natural environments.
Near the ruins, you can find the "Mt. Jyo Artillery Battery" and "Mt. Jyo Fortifications," which represent a different era of military technology from the 1900s. For a deeper dive into local history, we also recommend visiting the "Nagasaki Prefectural Tsushima Historical and Folklore Museum" in Izuhara-cho.
Preparation is key for a successful visit to the Kaneda Castle Ruins: