Nagoya Castle Nanban Plaster Wall and Northern Culvert: Edo-Period Remains
The eastern expanse of Nagoya Castle's Ninomaru area is home to quietly enduring remnants of the Edo period, including the Soketsu Site (former teahouse ruins), the Northern Culvert, and the Nanban Plaster Wall. In this article, we'll guide you through the historical context and highlights of each site, unveiling a lesser-known yet equally fascinating side of Nagoya Castle.
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3 Historic Remnants in the Eastern Ninomaru
From the Soketsu Site to the Nanban Plaster Wall, all three remnants sit within about a one-minute walk of each other in the eastern Ninomaru — the secondary compound that once surrounded Nagoya Castle's Honmaru keep. Each spot's highlights, visit time, access notes, and trivia are available by tapping "Open Details" on its card.
Soketsu Site (Former Teahouse Ruins)
The Soketsu Site is located within the Ninomaru Garden of Nagoya Castle and marks the remains of a teahouse built during the late Edo period, specifically around the Bunsei era (1818–1830). Several pavilions and guest spaces were constructed in the garden to accommodate visits from shoguns and members of the Tokugawa Gosanke (the three branch families of the Tokugawa clan). Of these, Soketsu was the largest and most prominent teahouse structure, built in the elegant sukiya-zukuri style (a refined architectural style associated with rustic teahouse aesthetics).
Today, the layout of the building — its pillars and foundation stones — has been outlined with stones and carefully preserved, allowing visitors to visualize the scale and elegance of this historical tea pavilion.
- Soketsu Site (Teahouse Ruins): The layout of foundation stones and pillars allows visitors to appreciate the architectural scale of the former teahouse.
- Site Preservation Based on Excavation: The teahouse layout, based on findings from a 1977 archaeological survey and historical records such as the Gojō Goten Garden Map, has been marked out with stones.
- Seasonal Experience: In spring, the surrounding garden is adorned with cherry blossoms, offering a scenic contrast between nature and historical remains.
Recommended visit time: Quick visit ~5 minutes / In-depth visit ~15 minutes
Address: 1-1 Honmaru, Naka-ku, Nagoya, Aichi Prefecture, inside Ninomaru Garden
Access: Approx. 1-minute walk (100m) from Ninomaru East Garden
Trivia- Historical Background: Among six known teahouses, Soketsu was the largest and built in the elegant sukiya-zukuri style.
- Hidden Detail: No commemorative plaques are present; instead, the building's shape is marked by stones and gravel, encouraging visitors to use their imagination.
- Famous Connections: Built as a reception facility for visiting shoguns and feudal lords of the Owari domain, it played a central role in welcoming distinguished guests.
Northern Culvert Kita Ankyo
The Northern Culvert is part of an underground drainage system built in the eastern garden section of the Ninomaru area. This important historical infrastructure reflects the advanced civil engineering of Edo-period castle design. It was used to collect rainwater from around the palace buildings using stone gutters and channel it through hidden culverts into the castle moat — demonstrating the castle's meticulous attention to hygiene and flood prevention.
The structure has been preserved in its original state as found during excavations and is currently open for public viewing.
- Exposed Culvert Structure: The original drainage system remains visible on-site, providing a rare look at Edo-period infrastructure.
- Stone Gutter Design: Constructed with different materials for the cover stones and side stones, offering insight into the period's engineering ingenuity.
- Seasonal Experience: In spring, the nearby cherry blossoms enhance the contemplative atmosphere of this historical site.
Recommended visit time: Quick visit ~5 minutes / In-depth visit ~10 minutes
Address: 1-1 Honmaru, Naka-ku, Nagoya, Aichi Prefecture, inside Ninomaru East Garden
Access: Approx. 1-minute walk (70m) from Soketsu Site
Trivia- Historical Insight: Far more than a drainage feature, the culvert was a critical part of the castle's environmental control system, carefully designed to redirect water to the moat.
- Hidden Detail: The culvert uses granite cover stones and hard sandstone side stones, showcasing sophisticated construction techniques and durability.
- Famous Connections: This infrastructure supported the living environment of the Owari feudal lords and their honored guests, playing a behind-the-scenes role in their comfort.
"The remains of the culvert-style drainage system on the outer edge of the garden, as seen in the Gojō Goten Garden Map, have been preserved in the same condition as when they were excavated.
According to the map, there used to be a flowerbed nearby.
This structure corresponds to the 'Stone Water Conduit' mentioned in the Kinjo Onkoroku and continues to channel rainwater from the garden into the moat.
The culvert materials include granite cover stones and hard sandstone side stones."
Note: The original signage has become weathered and difficult to read over time. The full transcription is provided here to aid visitor understanding.
Nanban Plaster Wall Nanban Neri Bei
Located on the northern edge of the Ninomaru area, the Nanban Plaster Wall is a rare and distinctive Edo-period structure. Unlike typical earthen walls, this one was constructed without wooden pillars or planks, using a method called "Nanban Tataki" — a mixture of clay and gravel kneaded with lime and oil, then solidified. This made the wall exceptionally durable.
Round gun ports (teppō-zama) were incorporated into the design, giving the wall a defensive function. Although only a small portion of the wall remains today, it is considered a valuable historical artifact that speaks to the military sophistication of Nagoya Castle.
- Nanban Plaster Wall: Built with unique materials and techniques, featuring circular gun ports for castle defense.
- Ninomaru Garden Nearby: The adjacent scenic garden is a designated cultural property, offering stunning seasonal views.
- Seasonal Beauty: Cherry blossoms in spring and colorful leaves in autumn enhance the charm of the area.
Recommended visit time: Quick visit ~5 minutes / In-depth visit ~10 minutes
Address: 1-1 Honmaru, Naka-ku, Nagoya, Aichi Prefecture, northern edge of Ninomaru
Access: Approx. 1-minute walk (100m) from the Northern Culvert
Trivia- Historical Background: The "Nanban Tataki" technique used in this wall was state-of-the-art for its time and helped boost the castle's defenses.
- Hidden Detail: Its unconventional structure sets it apart from other castle walls and makes it a point of interest for history enthusiasts.
- Famous Connections: The construction of Nagoya Castle — including this wall — was supervised by Tokugawa Ieyasu and involved military architects like Kato Kiyomasa.
A personal ranking based on repeated on-site visits by the Following the Shogun team (most recently June 2026). This is our own judgment, not the castle's official recommendation.
The one spot in this area where the real thing is still standing in front of you. Built without pillars or thick boards, using an unusual technique called nanban-tataki in which clay and gravel are compacted with lime and oil, it still shows its round gun ports. Only a short stretch survives, so check where it is before you set out or you will walk past it.
The remains of an underground drainage system from the Edo period. The appeal is the thinking behind it — stone gutters collecting rainwater and channelling it out to the moat — so it lands well if you are curious about the non-military side of castle engineering, and falls flat if you are not.
Said to have been the largest of the teahouses in the Ninomaru Garden, but no building survives — the outline is simply marked out in stone. It sits on the path through the garden, so reading the information board as you pass is enough.
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Nagoya Castle: Hours, Admission & Access
| Hours | 9:00 am – 4:30 pm (last entry to Honmaru Palace 4:00 pm) |
|---|---|
| Closed | December 29 – January 1 |
| Admission | Adults ¥500 (through September 30, 2026) / ¥1,000 (from October 1, 2026) Free for junior-high age and under, before and after the change Verified August 23, 2026. The increase was approved by the Nagoya City Council. Tickets bought before the change date remain valid afterwards. |
| Nearest station | Nagoya Castle Station (Meijo subway line), about a 5-minute walk |
Please check the official Nagoya Castle website for the latest hours and fees before you visit.
Why was Nagoya Castle built? Tokugawa Ieyasu, founder of the Tokugawa shogunate, ordered the castle rebuilt in November 1609; construction began in January 1610 and the main keep was completed in December 1612. It became the seat of the Owari Tokugawa family, the senior-most of the three Tokugawa branch houses (the Gosanke), and one of the most important castle towns in Japan.
FAQ
The Soketsu Site marks the ruins of a teahouse built within Nagoya Castle's Ninomaru Garden during the late Edo period's Bunsei era (1818–1830). Of six known teahouses in the garden, Soketsu was the largest, and today its layout is outlined with stones and gravel based on foundation stones and pillar positions.
The Northern Culvert was part of an underground drainage system in the eastern Ninomaru garden, collecting rainwater from around the palace buildings via stone gutters and channeling it through hidden culverts into the castle moat. It has been preserved in the state it was found during excavation and remains open for public viewing.
The Nanban Plaster Wall was built without wooden pillars or planks, using the "Nanban Tataki" method — clay and gravel kneaded with lime and oil, then solidified into an exceptionally durable wall. It also incorporates round gun ports (teppō-zama) for defense. Only a small portion survives today.
Nagoya Castle is open 9:00 am to 4:30 pm (last entry to Honmaru Palace at 4:00 pm), closed December 29 through January 1. Adult admission is currently ¥500, rising to ¥1,000 from October 2026. The nearest station is Nagoya Castle Station on the Meijo subway line, about a 5-minute walk.
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