218 Metres of Basalt Holding a Valley in Place
The Ayukawa Residence Stone Walls and Steps (鮎川家住宅石垣及び石段, Ayukawa-ke Jūtaku Ishigaki oyobi Ishidan, also listed as Ayukawa Family Residence Stone Wall and Stone Steps) are stone structures of about 1939 at Yamauchi-men, Tabira-chō, Hirado City, Nagasaki Prefecture, entered on Japan's national register of Tangible Cultural Properties on 23 October 2008 under registration number 42-0084.
The Agency for Cultural Affairs records the retaining walls at 218 metres in total length, a north stairway of 25 stone treads 1.7 metres wide, and a south stairway of 14 treads 1.5 metres wide. Numbers on a page understate it. Two hundred and eighteen metres is longer than two lengths of a running track's home straight, laid along the contour of a small valley.
The layout goes like this. Along the south edge of the property, the walls rise in two tiers. The upper tier runs 84 metres and varies between 0.2 and 3.2 metres high; the lower runs 104 metres at heights of 0.3 to 1.3 metres. That leaves 30 metres, which forms the side walls flanking the stairways. The wide range in the height figures is the point: on sloping ground the wall constantly adjusts how far it stands proud of the earth, unlike the uniform retaining walls of a flat site.
Three masonry techniques are at work, and they are not interchangeable. The walls themselves use tanizumi, in which squared blocks are set on the diagonal so that their corners point up and down and the joints read as a lattice of diamonds. Loads spread outward through the courses and rainwater drains freely; the method spread through Japan from the late Edo period onward and still lines railway cuttings and roadside embankments. The stairway side walls switch between nunozumi, coursed masonry with continuous horizontal joints, and kikkōzumi, tortoiseshell coursing, in which hexagonally dressed stones interlock like a honeycomb. The Agency's description credits this alternation with giving variety to the design, and the phrasing is apt: the change is a decision about display rather than structure.
The stone is Aō basalt. Nagasaki Prefecture's account of the property specifies that the walls and steps in front of the entrance use Aō stone quarried on Takashima, cut into hexagons and laid with unusual care. What the prefecture calls hexagonal stonework and what the national database calls kikkōzumi are the same thing seen from two angles.
Why Aō Stone Mattered
Aō basalt comes from the Aō district of Takashima, an island in Matsuura City off the north coast of Nagasaki Prefecture. The rock has an unusual combination of qualities: enough cohesion to take fine cutting without the arrises crumbling, and enough resistance to weathering that dressed faces hold their edge for generations. Softer stone would chip under a hexagonal cut; harder stone would make the labour uneconomic.
Hirado and this quarry go back a long way. During the Edo period the Aō workings served both the Hirado and Karatsu domains as official quarries. The stone shows up in the arch of Saiwaibashi in Hirado's old castle town, the bridge locals call the Dutch Bridge; in the walls of Hirado Castle; in the Jōtōbana seawall at the former Dutch Trading Post; and, further afield, in the great torii of Hakozaki Shrine in Fukuoka. In 1991 the Nagasaki governor listed Aō stoneware among the prefecture's traditional crafts.
Choosing this material around 1939 says something beyond convenience. Takashima lies roughly 20 kilometres northeast across open water from Tabira, so haulage was a real cost. What came with the stone was a lineage of masons who had worked it since the domain period. Cutting hexagons that lock together is not a job a mason takes on with unfamiliar rock. The decision to face the estate's outworks in Aō basalt was, in effect, a decision about which craftsmen would do the work.
There is a visual argument too. Dry basalt reads as a dull grey-black. Wet, it turns to a deep saturated black that throws the joint lines into relief. In a damp valley the walls change character with the weather, which is a slower and better effect than any applied ornament.
The Landscape Criterion, and Climbing the Steps
Registered Tangible Cultural Property is a lighter category than Important Cultural Property. Rather than the strict controls that follow designation, registration asks owners to notify the authorities before altering more than a quarter of a structure's exterior. Within that category, each entry is matched to a criterion, and the one applied here covers structures contributing to the historic landscape of the country. The main house on the same estate was registered the same day under a different criterion, the one for works serving as a model of design. The distinction is deliberate: the stonework is valued for what it does to the valley, not for its refinement as an object. The Agency's description closes by saying it builds a composed setting within the valley.
Two stairways serve the property. The northern flight has 25 treads at 1.7 metres wide, the southern 14 treads at 1.5 metres. Different counts and different widths suggest different jobs, the wider run reading as the principal approach and the narrower as a secondary way up. Climbing either one, the side walls give something to watch: horizontal courses running level for a stretch, then hexagons appearing in the coursing. The design shifts at walking pace.
All of this stands on private land. The Ayukawa Residence is a family home and is normally closed to visitors. Nagasaki Prefecture lists interior viewing as by advance appointment on 0950-57-0066, and access to the steps themselves rests entirely on the owner's decision. Call before making the trip. Arrangements shift, so contacting Hirado City's Cultural Exchange Division on 0950-22-9143 or the Hirado Tourism Association is a sensible backup. Treat photography as requiring permission. Viewing the walls from the public road is fine; entering the grounds is not.
Trains run to Tabira-Hiradoguchi Station on the Matsuura Railway Nishi-Kyūshū Line, about ten minutes' walk away and sharing the property's address block of Yamauchi-men. The station holds the title of westernmost in Japan among ordinary railways under the Railway Business Act, and part of the building is a free railway museum. Sasebo to Tabira-Hiradoguchi takes about ninety minutes.
For more of the same stone, cross the Hirado Bridge into the old castle town. The curve of Saiwaibashi, the castle walls, the Jōtōbana seawall: all Aō basalt, all doing different work in different centuries. Following the material from a 1930s house terrace back to a seventeenth-century bridge makes a coherent day. The quarry district itself can be visited on Takashima in Matsuura City.
- 📍 Plan Your Visit to Nagasaki
- Find tours, activities & transport passes near Ayukawa Family Residence Stone Wall and Stone Steps
- [ Gunkanjima Island Landing & Glover Garden Tours ]
Q&A
- How large are the Ayukawa Residence Stone Walls and Steps?
- The Agency for Cultural Affairs records 218 metres of stone retaining wall in total, a north stairway of 25 treads 1.7 metres wide, and a south stairway of 14 treads 1.5 metres wide. The walls break down into an upper tier of 84 metres at 0.2 to 3.2 metres high and a lower tier of 104 metres at 0.3 to 1.3 metres, with the remaining 30 metres forming the stairway side walls. The whole is registered as a single structure.
- What kind of stone was used for the Ayukawa Residence Stone Walls and Steps?
- Nagasaki Prefecture identifies it as Aō basalt from Takashima, an island in Matsuura City. The rock takes fine cutting without crumbling and resists weathering, which made hexagonal dressing practical. The Aō quarries supplied the Hirado and Karatsu domains during the Edo period, and the same stone appears in Hirado Castle's walls, the Saiwaibashi bridge, and the great torii of Hakozaki Shrine in Fukuoka.
- What masonry techniques appear in the Ayukawa Residence Stone Walls and Steps?
- The retaining walls use tanizumi, squared blocks set on the diagonal so the joints form a diamond lattice, which spreads load and drains well. The stairway side walls alternate nunozumi, coursed work with level horizontal joints, and kikkōzumi, hexagonally cut stones interlocking like a honeycomb. The Agency for Cultural Affairs notes that this alternation introduces variety into the design.
- Can visitors see the Ayukawa Residence Stone Walls and Steps?
- The walls and steps stand on private land at a house that is normally closed. Nagasaki Prefecture lists viewing as by advance appointment on 0950-57-0066, and access to the steps depends on the owner's consent. Call before travelling. The walls can be seen from the public road, but entering the grounds is not permitted.
- How do the Ayukawa Residence Stone Walls and Steps relate to the main house?
- They belong to the same estate and were registered on the same day, 23 October 2008, as two separate entries under two criteria. The main house (42-0083) qualified as a model of design; the stone walls and steps (42-0084) qualified for contributing to the historic landscape. In 2010 Nagasaki Prefecture listed house and stonework together as a single townscape asset.
Basic Information
| Name | Ayukawa Residence Stone Walls and Steps (鮎川家住宅石垣及び石段 / Ayukawa-ke Jūtaku Ishigaki oyobi Ishidan) |
|---|---|
| Location | 742 Mizunashi, Yamauchi-men, Tabira-chō, Hirado City, Nagasaki Prefecture |
| Designation | Registered Tangible Cultural Property (Structure); criterion: contribution to the historic landscape; registration number 42-0084 (61st round) |
| Year Designated | Registered 23 October 2008; published 10 November 2008 |
| Quantity | 1 structure |
| Dimensions | Stone walls 218 m total (upper tier 84 m at 0.2–3.2 m high; lower tier 104 m at 0.3–1.3 m; stairway side walls 30 m); north stairway 25 treads, 1.7 m wide; south stairway 14 treads, 1.5 m wide |
| Owner | Private |
| Public Access | Normally closed; viewing by advance appointment (0950-57-0066) |
References
- National Cultural Properties Database ― Ayukawa Residence Stone Walls and Steps (Agency for Cultural Affairs)
- https://kunishitei.bunka.go.jp/heritage/detail/101/00007421
- Cultural Heritage Online ― Ayukawa Residence Stone Walls and Steps
- https://online.bunka.go.jp/heritages/detail/187323
- National Cultural Properties Database ― Ayukawa Residence Main House
- https://kunishitei.bunka.go.jp/heritage/detail/101/00007420
- Ayukawa Residence, Nagasaki Prefecture Townscape Asset listing
- https://www.pref.nagasaki.jp/bunrui/machidukuri/toshikeikaku-kokudoriyo/keikan/63595.html
- Register of Townscape Assets (Structures), Nagasaki Prefecture
- https://www.pref.nagasaki.jp/doc/page-471733.html
- Aō Stone, Matsuura City tourism information
- https://matsuura-guide.com/kanko/tokusanhin/aouishi/
Last verified: 2026.08.20