Guide
The Obama Castle Ruins, located in the Jonai area of Obama City, Fukui Prefecture, are the remains of a 'Sea Castle' (Kaijo) built during the early Edo period. A 'Sea Castle' is a specific fortification style that utilizes the sea, rivers, and wetlands as natural outer moats. The site's unique structure was shaped through the initial construction by the Kyogoku clan and subsequent large-scale renovations by the Sakai clan. Although the original keep and main buildings are no longer standing, the surrounding stone walls (ishigaki) and historical architectural remains still vividly convey the grandeur of the former castle.
The history of Obama Castle began in 1601 with construction initiated by Kyogoku Takatsugu. While originally intended to replace Noseyama Castle, the Kyogoku clan was transferred before completion. Subsequently, the Sakai clan implemented a large-scale redesign incorporating the architectural style of Nijo Castle. Completed in 1642, the castle served as the seat of the Wakasa-Sakai clan. During the Meiji era, it played a military role as a branch of the Osaka Garrison, though many structures were lost to fire. Today, it is preserved as a significant historical site that tells the story of the region's past.
The most striking feature is the stone wall ruins surrounding the central area. Once home to a castle tower (tenshu) and turrets, the site was naturally protected by the Kitagawa and Minamigawa rivers and the sea. Visitors can visually grasp the defensive mechanisms of the era by observing the perimeter walls. Another significant relic is the 'Junzo-mon' gate—the original entrance to the former domain school (Junzo-kan)—which has been preserved and moved to the current Fukui Prefectural Wakasa High School. Additionally, the relocation of the Shoin-genkan entrance to Tadatera Temple allows visitors to experience the broader cultural and architectural reach of the castle's era.
The Obama Castle Ruins offer different charms depending on the season. In spring, the nearby Obama Park and surrounding areas burst into color with beautiful azaleas. In autumn, the changing colors of the foliage harmonize beautifully with the ancient stone walls, creating a serene landscape. While daytime is ideal for observing the structural details of the stone walls, visiting during twilight offers a more profound, quiet atmosphere reflective of its history as a 'Sea Castle.'
Rather than viewing massive structures, the experience here centers on 'historical walking.' Visitors can trace the terrain and stone walls to understand how the castle utilized the sea and rivers for defense. Exploring the relocated architectural pieces like the Junzo-mon provides a tangible connection to the transition from the Edo to the Meiji periods. A walk through this area, combined with the nearby historic streets, offers a deep dive into local culture.
Several sites of historical value are scattered around the ruins, such as Myotsu-ji and Kamo Shrine, which share the historical context of the castle town. In the center of Obama, the 'Mikaguni Wakasa Obama Food Culture Museum' offers insights into the local culinary heritage. Furthermore, the nearby natural scenery, such as the Sotomo rock formations in Wakasa Bay, creates a wonderful sightseeing route combining history and nature.
As the site includes uneven terrain and stone walls, comfortable walking shoes are highly recommended. Please note the following: