Nochiseyama Castle Ruins: A Mountaintop Fortress Above Obama Port
In 1522, Takeda Motomitsu, the military governor of Wakasa Province, ordered a fortress raised on the summit of Mount Nochise, a wooded hill of about 146 meters that rises directly behind the harbor town of Obama on the Sea of Japan. The position was no accident. Obama was the deep-water port closest to Kyoto, a place where goods from the Asian mainland came ashore and moved inland toward the capital. Whoever held these heights held the harbor.
The castle Motomitsu built served as the principal seat of the Wakasa Takeda for four generations before passing to a succession of warlords close to Toyotomi Hideyoshi. When it fell out of use around 1600, it left behind an unusually complete set of mountain defenses. Stone ramparts, terraced enclosures, and long ranks of hillside trenches still lie beneath the forest canopy. The site carries protection as a National Historic Site.
Why a Governor Took to the Heights
When Motomitsu inherited leadership of the clan, the Takeda position was anything but secure. Earlier generations had held Wakasa and Aki and claimed the governorship of Tango as well, but a failed invasion of Tango in 1507 and a revolt by the senior Henmi retainers in 1517 left the family pressed from inside and out. The old Takeda residence sat on flat ground, convenient for administration and weak for defense. Later chronicles describe several thousand laborers hauling stone up the slope to raise walls and turrets, work done with war in mind.
Lordship ran from Motomitsu to Nobutoyo, then Yoshizumi, then his son Motoaki. Family feuding kept the clan brittle, and the powerful Asakura of neighboring Echizen kept pressing. In 1568 Asakura forces seized Motoaki and carried him off to Echizen, draining away what remained of Takeda authority over the province. The line met its end in 1582, in the turmoil that followed the death of Oda Nobunaga at Honnō-ji.
What happened next shows how much the place was worth. Niwa Nagahide took the castle and, in the tenth month of 1582, strengthened its works against his rival Shibata Katsuie. Asano Nagayoshi, later known as Nagamasa, held it from 1587, and Kinoshita Katsutoshi followed in the early 1590s. Each of these men stood near the center of Hideyoshi's power. The castle's working life closed in 1600, when Kyōgoku Takatsugu entered Wakasa, chose to build a new castle on the coastal plain at Obama, and allowed the mountain fortress to be abandoned.
What the Ground Has Revealed
In 1987 and 1988 the Obama City Board of Education excavated one of the enclosures southwest of the summit, a level below the main keep. They uncovered the foundation stones of a substantial building, roughly 15.3 meters east to west and 7.8 meters north to south, set with a paved-stone entrance. The remains showed two phases of construction: the later builders reused most of the earlier footing stones but reshaped the building and rebuilt the entrance. An artificial garden mound ran along the earthen rampart beside it.
The objects pulled from the soil tell their own story. Among them were celadon and white porcelain, blue-and-white ware, ceramics from the Seto and Mino kilns, the base of a Korean stoneware bottle, an incense burner, a brazier, and a crucible. Roof tiles were scarce, enough only to finish the ridge line rather than cover a roof. This was the household of provincial governors and, later, of Hideyoshi's trusted men, and the finds reflect a life of some refinement rather than a bare garrison.
The Agency for Cultural Affairs designated the ruins a National Historic Site in 1997, with a further extension to the protected area in 2016. The protected ground now covers more than 360,000 square meters. The reasons given were direct: the castle commanded the Japan Sea port nearest the capital, it was raised by the provincial governor and later entrusted to senior figures of the Toyotomi regime, its scale matched the standing of those lords, and its remains had survived in remarkably good condition.
What to Look for on the Climb
The summit holds the main enclosure, known by the nickname Goten, or "the palace." Around it stand walls of nozura-zumi, uncoursed natural stone laid without dressing, with an L-shaped stone rampart on the west side that researchers attribute to the Niwa Nagahide period. From here two arms of the castle reach out, one to the north-northeast and one to the northwest, each ridge carrying a string of terraced baileys stepped down the slope. The valley between the two ridges, lower down, held the lord's residence.
The feature worth the extra walk lies on the western flank. There, close to twenty parallel trenches run straight down the hillside in a tight rank, a textbook example of what Japanese castle scholars call unejō-tatebori, a "ridge-pattern" cluster of vertical dry moats. Cut down the slope rather than across it, these trenches stopped attackers from moving sideways along the hillside to mass for an assault. Seen from the ridge above, the parallel grooves read almost like the corrugations of a washboard pressed into the forest floor.
The reward at the top is the view. From the cleared ground near the keep, Obama Bay opens out below, and on a clear day the harbor that the castle was built to guard lies spread beneath your feet. Stop here before turning back, and the logic of the whole site falls into place.
Getting There and Nearby Sights
The trail begins at Atago Shrine, about 0.8 kilometers from JR Obama Station and reachable on foot in roughly ten minutes. A stone torii marks the entrance, and the climb to the main keep takes about forty minutes. The shrine itself now sits in the old summit enclosure, so reaching the castle and paying respects amount to the same walk. There is a small parking space by the torii and a box of pamphlets at the trailhead; maps can also be downloaded in advance from the Obama city tourism site. The path is steep and can be slippery after rain, so proper walking shoes are sensible.
At the foot of the mountain, in the northeast direction traditionally guarded against misfortune, stands Hosshin-ji, a Sōtō Zen temple that Motomitsu founded in 1521. It keeps his memorial pagoda, a seated wooden image of him, and painted portraits, and it is still an active training hall known for its midwinter ascetic practice. Closer to the water you can visit Kūin-ji, tied to the old legend of the eight-hundred-year mermaid-flesh nun, and the ruins of Obama Castle, where curving stone walls survive beside the river. Mount Nochise itself has a literary fame older than any of its stones: the poet Ōtomo no Yakamochi wove its name into a verse in the eighth-century Man'yōshū, playing on "nochi," meaning "later," in a poem about meeting again in time to come.
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Q&A
- Is there a castle building to go inside?
- No. No structures from the castle survive. What remains are earthworks: stone walls, terraced baileys, defensive trenches, and the excavated building foundations. A small shrine, Atago Shrine, now occupies the former main enclosure at the summit.
- How long and how hard is the climb?
- Allow about forty minutes from the Atago Shrine torii to the main keep. The grade is steep with stone steps near the start and rougher rock footing higher up, and the surface gets slick in wet weather. Walking or trekking shoes are recommended.
- Who built the castle, and when?
- Takeda Motomitsu, the military governor of Wakasa, built it in 1522. He needed a stronger position than the clan's earlier flatland residence as both internal revolts and the neighboring Asakura clan threatened his hold on the province.
- Why was such an important castle abandoned?
- When Kyōgoku Takatsugu became lord of Wakasa in 1600, he built a new castle on the coastal plain at Obama, better suited to the era's administration and easier to reach. With the new seat in use, the mountain fortress was retired.
- Is there an entrance fee, and when can I visit?
- The site is an open hillside with no admission fee and no fixed hours, so daylight visits are best. Pamphlets are available at the trailhead and through the Obama tourism office; there is no staffed facility on the mountain itself.
Basic Information
| Name | Nochiseyama Castle Ruins (Nochiseyama-jo ato) |
|---|---|
| Location | Fushihara and adjacent districts, Obama City, Fukui Prefecture |
| Designation | National Historic Site |
| Date designated | May 23, 1997; protected area extended October 3, 2016 |
| Designation criterion | Category 2: castle sites and other sites relating to government and politics |
| Protected area | Approximately 362,590 square meters |
| Built | 1522, by Takeda Motomitsu, military governor of Wakasa |
| Abandoned | Around 1600, after Kyogoku Takatsugu built Obama Castle |
| Access | About 0.8 km (roughly 10 minutes on foot) from JR Obama Station to the Atago Shrine trailhead; about 40 minutes on foot to the main keep |
| Admission | Free; open hillside with no fixed hours |
References
- National Designated Cultural Properties Database, Agency for Cultural Affairs (Nochiseyama Castle Ruins)
- https://kunishitei.bunka.go.jp/bsys/maindetails/401/1074
- Cultural Heritage Online, Agency for Cultural Affairs (Nochiseyama Castle Ruins)
- https://online.bunka.go.jp/heritages/detail/171995
- Obama City Official Website (Nochiseyama Castle Ruins)
- https://www1.city.obama.fukui.jp/kanko-bunka/jisha-shiseki/75.html
- Wakasa Obama Tourism Site (Marutto Obama)
- https://wakasa-obama.jp/obamanavi/nochise-mountain-castle/
Last verified: 2026.05.29