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Saga · Yoshinogari

Yoshinogari Historical Site

吉野ヶ里

Yoshinogari, Saga

CastleFlatland castle (hirajiro)Japan's 100 Fine Castles No. 88

What makes this castle distinctive

A farming village from some 2,000 years ago, with no stone walls and no keep, is one of Japan's 100 Fine Castles.

Why?

Yoshinogari is not a samurai castle. It is the site of a large settlement from the Yayoi period (roughly 5th century BC to 3rd century AD), defended by deep ditches, wooden fences and watchtowers. The Japan Castle Foundation chose it for the 100 Fine Castles list as a moated village regarded as the beginning of castle building in Japan. Here you can see the starting point of the idea of a castle: enclosing and defending the place where people live together.^[18][7][5]

Three things not to miss

The main ceremonial hall in the North Inner Enclosure

Where: In the center of the North Inner Enclosure, at the north of the moat-encircled village zone
What to look at: The large raised-floor main hall, the hook-shaped entrance, and the watchtowers around it
Why it's interesting: The North Inner Enclosure is thought to be where the whole community discussed its most important matters and honored its ancestors. Judging from the thickness and spacing of its posts, the main hall was rebuilt as a multi-level raised-floor building, presented with a council meeting on the second floor and a priest listening for the ancestors' voices on the third. The park explains that the hook-shaped entrance, which stops anyone walking straight in, reflects the influence of walled cities in ancient China.^[3][7]
Can you see it?: Visible from outsideYou can enter the reconstructed buildings (park admission required).

The V-shaped outer ditch and sharpened stakes

Where: The moat entrance just inside the East Entrance (thought to be the village's east main gate) and the outer ditch around the settlement
What to look at: The deep V-shaped ditch, the earth bank and fence outside it, and the angled sharpened stakes (sakamogi)
Why it's interesting: The outer ditch enclosed more than 40 hectares and ran over 1 km from north to south. It was usually 2.5–3 m wide and about 2 m deep, and up to 6.5 m wide and 3 m deep at its largest. No trace of water has been found in it, so it is thought to have worked like the dry moats of later medieval castles. It shows that, as in later castles, digging and enclosing was the foundation of defense.^[5][2]
Can you see it?: Visible from outsideVisible from the park paths. The ditches and fences are reconstructions based on excavations.

Real burial jars inside the North Burial Mound

Where: Inside the North Burial Mound, north of the North Inner Enclosure
What to look at: Burial jars (kamekan, large pottery coffins) displayed where they were found
Why it's interesting: The North Burial Mound is an artificial hill built from many layers of tamped earth and is thought to be the tomb of successive rulers. Fourteen burial jars were found inside, some with glass tube beads and a rare bronze sword made entirely of bronze, even its grip. The interior is kept at a constant temperature and humidity so that the actual remains can be seen.^[4][2][7]
Can you see it?: Visible from outsideYou can go inside. The swords and beads on display there are replicas.

At a glance for visitors

Nearest station: 15 min walk from JR Yoshinogari-koen Station
Climb: Not confirmed
Time neededEditors' estimate: Allow 2–3 hours to see the main archaeological area (the moat-encircled village zone and the North Burial Mound).
Admission: Adults (15 and over) 460 yen; seniors (65 and over) 200 yen; free for junior high school students and younger. Groups of 20+: adults 280 yen. Free for holders of disability certificates and one companion.
Hours: 9:00–17:00 (9:00–18:00 from June 1 to August 31)
Access: Open to visitors
Open to the public as Yoshinogari Historical Park (admission charged). The East Entrance is the most convenient for the archaeological area. In the South and North Inner Enclosures, staff dressed as Yayoi people give free guided explanations throughout the day.

Checked: 2026-10-03

View on map Open in Google Maps Yoshinogari Historical Park (official site)Yoshinogari Historical Park (English)Saga Prefecture: Yoshinogari Special Historic Site (Japanese)

The story of this castle

Historical record

A terrace between the mountains and the plain

The Yoshinogari site lies on a long, narrow terrace that runs from the southern foot of the Sefuri Mountains down to the Saga Plain. The eastern Saga Plain has many such terraces, and all of them have long been known to hold ancient sites. The Yayoi period was the age when rice farming spread across Japan and people began to live in one place for generations.^[1]

Scholarly interpretation

From village to the center of a small state

Unlike a samurai-era castle, Yoshinogari was not built by a single lord. In the early Yayoi period, small villages appeared across the hill, and a settlement enclosed by a ditch formed in the south. It grew from about 2 hectares to more than 20 hectares, and finally, in the late Yayoi period, to over 40 hectares, one of the largest moated settlements in Japan. It is thought to have become the center of a small state (kuni) that brought surrounding villages together.^[2][13]

Scholarly interpretation

A place of ritual and rule, guarded by ditches, fences and towers

At its height, the settlement was protected by a V-shaped outer ditch, fences and watchtowers. Inside were the North Inner Enclosure, thought to be the place for rituals and decisions; the South Inner Enclosure, thought to be where the ruler and leading families lived; and an area of storehouses where goods were gathered and a market may have been held. Defenses grew stronger from the middle Yayoi period on, which suggests that conflicts were becoming fiercer.^[2][6][7]

Scholarly interpretation

In the mid-3rd century, the village became a burial ground

By the end of the Yayoi period in the mid-3rd century, the ditches around the settlement had largely filled in, and they are thought to have lost their function along with the inner enclosures. Around that time, keyhole-shaped tombs with square rear mounds were built near the South Inner Enclosure, and the southern part of the hill changed from a place where people lived to a place where they were buried.^[2]

Historical record

From an industrial park plan to a Special Historic Site

In the 1980s, Saga Prefecture planned an industrial park on this hill, and full-scale excavations began in 1986 as part of the preliminary survey. They revealed the full extent of a large Yayoi site, and the industrial park plan was revised. The site became a National Historic Site in 1990 and a Special Historic Site in 1991, and the finds from the North Burial Mound were designated Important Cultural Properties the same year.^{[1][13][15][16]}

Historical record

Reconstructions built above protected remains

Today the site is Yoshinogari Historical Park, developed by the national government and Saga Prefecture over a planned area of about 117 hectares. Aiming to show the settlement at its height around the 3rd century, the park covers the important remains with soil to protect them and has rebuilt the buildings directly above where they stood. In 2022, excavation began in the "mystery area" that had never been investigated, and in 2023 a stone coffin with a lid carved with incised marks was found there.^{[2][13][17][19]}

Timeline

紀元前1世紀
Estimated (middle Yayoi period)
The North Burial Mound is built, with bronze swords and glass beads placed in the burials^[1][4]
3世紀ごろ
Estimated (late Yayoi period)
The moated settlement, with its two inner enclosures, reaches its height^[1][2]
3世紀中ごろ
Estimated
The ditches fill in and the southern hill becomes a burial ground^[2]
1986
Saga Prefecture begins full-scale excavations^[1][13]
1990
Designated a National Historic Site^[15]
1991
Upgraded to a Special Historic Site; finds from the North Burial Mound become Important Cultural Properties^[14][15][16]
2023
A stone coffin with an incised lid is found in the "mystery area"^[13][17]

Buildings and remains

The keep today

No keep was built

As a Yayoi-period moated village it never had a keep; it belongs to a completely different tradition from samurai-era castles. The tall structures you see are reconstructed watchtowers and ceremonial halls.

The site today

Developed as Yoshinogari Historical Park, with late-Yayoi buildings, ditches and fences reconstructed directly above the remains in the moat-encircled village zone. This is not a samurai-era castle but the site of a Yayoi-period moated settlement.

Main buildings

Modern reconstruction

North Inner Enclosure (main ceremonial hall, watchtowers and others; 9 buildings)

Reconstructed on top of the excavated building sites.^[7][3]

Modern reconstruction

South Inner Enclosure (4 watchtowers, 11 pit dwellings and others; 20 buildings)

Reconstruction of the area thought to have housed the ruler and leading families.^[7][6]

Modern reconstruction

South Village (27 buildings)

The area thought to have housed ordinary people.^[7]

Exterior restored

North Burial Mound

Exterior restored; the 14 real burial jars can be seen inside.^[7][4]

Modern reconstruction

Outer ditch, sharpened stakes and fences

Reconstructed from excavation results; part of the outer ditch was rebuilt in a modified shape to protect the remains.^[5]

Key facts

Type: Castle
Setting: Flatland castle (hirajiro)built on flat ground, defended by moatsEditorial article
Period: Ancient (before c.1185)Editorial article
Keep (tenshu): No keep was builtthe castle never had a keepEditorial article
Remains to see: MoatsEditorial article
Designation: National Historic Site (Yoshinogari Site) (1990); Special Historic Site (Yoshinogari Site) (1991); Important Cultural Property (finds from the burial mound at Yoshinogari) (1991)Editorial article
Selection: Japan's 100 Fine Castles No. 88Japan Castle Foundation

Visiting

Access

Open to visitors

Open to the public as Yoshinogari Historical Park (admission charged). The East Entrance is the most convenient for the archaeological area. In the South and North Inner Enclosures, staff dressed as Yayoi people give free guided explanations throughout the day.

Address

1843 Tade, Yoshinogari-cho, Kanzaki-gun, Saga 842-0035 (Yoshinogari Historical Park)^[8]

Checked: 2026-10-03

Nearest stations and how to get there

JR Yoshinogari-koen StationJR Nagasaki Main Line

about 15 min walk · Not confirmed

About 15 minutes on foot to the park's East Entrance (main gate). Rental bicycles (300 yen) are available at the community hall by the station's north exit. From JR Kanzaki Station it is about 15 minutes on foot to the West Entrance.^[9]

Checked: 2026-10-03

Tade / Yoshinogari Rekishi Koen Minami bus stop (Nishitetsu Bus)Bus route 40 (about 40 minutes and 600 yen from Saga Station Bus Center; about 40 minutes and 670 yen from Nishitetsu Kurume)

about 5 min walk · Not confirmed

Walk about 300 m north from the Tade intersection, passing under the JR overpass, to the park entrance. Fares and times are approximate as of February 1, 2025.^[9]

Checked: 2026-10-03

Hours and admission

Yoshinogari Historical Park

Hours: 9:00–17:00 (9:00–18:00 from June 1 to August 31)
Closed: December 31, and the third Monday of January and the following day
Admission: Adults (15 and over) 460 yen; seniors (65 and over) 200 yen; free for junior high school students and younger. Groups of 20+: adults 280 yen. Free for holders of disability certificates and one companion.^[8][10]

Checked: 2026-10-03

By car / parking

About 5 minutes south on Route 385 from the Higashisefuri IC of the Nagasaki Expressway. Parking includes 540 spaces at the East Entrance (310 yen per car normally); until March 31, 2027, parking is free for cars and motorcycles as part of a campaign marking the new West Entrance.^[8][9]

Checked: 2026-10-03

Grounds opening hours

9:00–17:00 (9:00–18:00 from June 1 to August 31)^[8]Checked: 2026-10-03

Time neededEditors' estimate

Allow 2–3 hours to see the main archaeological area (the moat-encircled village zone and the North Burial Mound).

Steps, slopes and footing

The park is large but mostly flat. The only steps are in front of the Historical Park Center at the East Entrance, and there is a ramp alongside them.^[10]

Wheelchairs and strollers

Ramps run alongside the steps at the East Entrance. Wheelchairs can be borrowed free at each entrance (6 manual and 6 electric at the East Entrance). An in-park bus gives priority to people with disabilities and older visitors, and one vehicle is wheelchair-accessible. Every toilet block has an accessible toilet.^[10][8]Checked: 2026-10-03

Toilets and rest

Toilets throughout the park, with handrails and baby-changing tables^[8][10]

English signs / audio guide

The official website has English pages. Audio guide pens in English, Korean, Chinese and Japanese can be rented at the East Entrance information desk (500 yen plus a 500-yen deposit; no earphones provided).^[11]

Seasons

The official website posts seasonal flower updates, such as red spider lilies in autumn.^[20]

Photography

Personal photography needs no permit. Shoots that occupy a space or are for commercial use require advance permission.^[12]

Works, closures and restrictions

Parking is free for cars and motorcycles until March 31, 2027 (new West Entrance campaign). Updates on the "mystery area" excavations are posted on Saga Prefecture's dedicated website, Nazohoru Yoshinogari.^[8][13]Checked: 2026-10-03

Editors' guide

An editorial guide based on sources and confirmed information — not a first-hand visit report.

Who will enjoy it

Good for anyone curious about where castles began, visitors who want to step inside buildings and get a feel for Yayoi-period life, and families who want a big park to walk around.

What makes it interesting

Enter at the East Entrance and start with the outer ditch and sharpened stakes to see how the village was defended, then climb a watchtower in the South Inner Enclosure to look over the whole settlement. Continue to the main ceremonial hall and hook-shaped entrance of the North Inner Enclosure, and finish with the real burial jars inside the North Burial Mound to take in defense, ritual and burial together.

Before you go

This is not a samurai castle but the site of a Yayoi-period settlement about 2,000 years old. All the buildings are reconstructions based on excavations and research, and some details are educated guesses. The park is very large, so wear comfortable shoes and allow plenty of time.

Ways to enjoy it

Chat with the staff dressed as Yayoi people in the inner enclosures to learn what each building was for. On the first Saturday and third Sunday of every month, free special guided walks of the archaeological area leave the East Entrance at 10:00 and 13:00 (no booking needed).

Photos

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Open questions

The Japan Castle Foundation classes Yoshinogari as a flatland castle (moated village), but the site sits on a terrace. It cannot really be measured against the flatland and mountain castles of the samurai era.
The shapes and uses of the reconstructed buildings, such as councils and prayers in the main hall or the ruler's house in the South Inner Enclosure, are the park's interpretations based on excavations and research.
The official description says the site evokes the era of Yamatai, the realm described in Chinese records, but gives no evidence linking it to Yamatai itself.
Dates for the start of the Yayoi period and the first moated village differ even within the park's own pages (5th or 3rd century BC), and the early village is given as 2 or 2.5 hectares.
According to national records, the site was designated a Historic Site on May 19, 1990, and a Special Historic Site on May 28, 1991.