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Stone walls on a hilltop enclosure, with the surrounding mountains, June 2009. Iwamura Castle sits on a 717 m peak.
takami toraoPublic domainWikimedia Commons

Gifu · Ena

Iwamura Castle

岩村城

Ena, Gifu

CastleMountain castle (yamajiro)Japan's 100 Fine Castles No. 47

What makes this castle distinctive

On a 717-meter mountain, tiers of stone walls with no buildings left on them climb through the forest.

Why?

Iwamura is a mountain castle built on the summit of Shiroyama. All its buildings were dismantled when the castle was abolished in the Meiji era, but the enclosures, tall stone walls and wells survive well. Ena City says the remains seen today were built by the Ogyu-Matsudaira family, who became lords in 1601. Mist rises easily on this mountain, and the castle is also called Kirigajo, the Castle of Mist.[1][4][7]

Three things not to miss

01
A long, tall stone wall running along the mountainside, June 2009.takami toraoPublic domainWikimedia Commons

The tall walls around the main enclosure, including the six-tier wall

Where
Around the main enclosure (honmaru) at the summit.
What to look at
Stone walls stacked in several tiers up the slope.
Why it's interesting
Few castles have this much stone walling surviving on a mountaintop. A local group even calls the walls around the main enclosure 'the Machu Picchu of the East' for their ruin-like grandeur. Ena City lists the six-tier wall (Rokudan-heki) among the city-owned areas that anyone may visit and photograph.[2][4]
Can you see it?
Visible from outsideOpen to visit; reached by walking up mountain paths.
02

Kirigai, the Mist Well

Where
The Hachiman enclosure.
What to look at
The well said to have been reserved for the lord.
Why it's interesting
Although it sits on a mountain, the castle had as many as 17 wells. The Edo-period local history 'Gan'yu Fushi' records that when enemies attacked, a dragon's bone kept in the castle was thrown into this well, and mist poured out and wrapped the castle. This is said to be the source of the name Kirigajo.[2]
Can you see it?
Not confirmedCurrent viewing conditions not confirmed.
03
The restored front gate and drum turret at the site of the lord's residence at the foot of the mountain, May 2023. The Iwamura History Museum is next to it.名古屋太郎CC BY-SA 4.0Wikimedia Commons

The lord's residence site and Iwamura History Museum

Where
The site of the Iwamura domain lord's residence at the northwest foot of Shiroyama.
What to look at
The restored front gate and drum turret, and castle drawings designated as Prefectural Important Cultural Properties.
Why it's interesting
In the early Edo period Matsudaira Ienori moved the lord's residence from the mountaintop down to its foot. The gate, drum turret and palace tea room have been rebuilt on that site, and the gate of the domain school Chishinkan has been moved there. The museum holds castle and domain materials such as a 1718 drawing of Iwamura Castle.[3][5][7]
Can you see it?
Visible from outsideThe museum charges admission (adults 300 yen). The main enclosure is about 20 minutes' walk from here.

At a glance for visitors

Nearest station
40 min walk from Iwamura Station (Akechi Railway)
Climb
Steep climb
Time neededEditors' estimate
About 2–2.5 hours for the round trip from the museum to the summit, including looking around.
Admission
Adults 300 yen, 65 and over 200 yen, high school students and younger free
Hours
April–November 9:00–17:00; December–March 9:30–16:00
Access
Open to visitors

The ruins on the mountain are open to visit. The main enclosure, east enclosure, outer bailey (demaru) and six-tier wall are city land where no permit is needed to take photos (drone flights should be reported in advance to the city's Culture Division). Other parts belong to private landowners. The Japan 100 Castles stamp location is not confirmed.

Checked:

View on mapOpen in Google MapsCastle sites of Ena City (Japanese)Iwamura History Museum (Ena City, Japanese)Iwamura Castle ruins (Hot Iwamura, Japanese)

The story of this castle

01
Tradition

A mountain castle from the Kamakura period

Tradition says the castle was founded in 1185 by Kato Kagekado, a senior retainer of Minamoto no Yoritomo, when he became steward of this land. His descendants, the Toyama clan, held the castle until the Sengoku period. Shiroyama has 180 m of difference in height, and the castle made full use of the steep terrain.[2][5]

02
Tradition

The woman lord caught between Oda and Takeda

In the Sengoku period, Iwamura lay on the border between the Oda and Takeda clans. When the lord Toyama Kagetou died, tradition says his widow, an aunt of Oda Nobunaga, adopted Nobunaga's young son Gobomaru and ran the castle herself. Besieged by the Takeda general Akiyama Nobutomo (Torashige), she surrendered on condition that she marry him. In 1575 Nobunaga's heir Nobutada retook the castle, and she and Akiyama are said to have been executed.[2][5]

03
Historical record

Today's walls date from the Matsudaira era

After the Oda took it, the castle was remodeled by Kawajiri Hidetaka and by Kakami Motomasa, castle keeper for the Mori family. In 1601 Matsudaira Ienori of the Ogyu-Matsudaira family became lord and the Iwamura domain was founded; Ena City says the remains seen today come from the Ogyu-Matsudaira rebuilding. Ienori moved the lord's residence from the mountaintop to its foot and laid out the castle town.[4][5]

04
Historical record

Buildings gone; walls and wells remain

Iwamura served as a domain castle throughout the Edo period. Under the Meiji abolition of castles its buildings were dismantled, leaving only the stone walls, and in 1881 the remaining lord's residence burned. Some of the castle gates survive, moved to temples in the town as entrance gates.[5]

05
Historical record

Protected as a prefectural historic site

The ruins are a Gifu Prefectural Historic Site. At the foot of the mountain, the gate and drum turret were rebuilt on the lord's residence site, and the Iwamura History Museum was built. The castle was named one of Japan's 100 Fine Castles in 2006, and Ena City carried out excavations and a survey of the castle town in fiscal 2008–2012.[1][3][7][5]

People of this castle

Timeline

  1. Kato Kagekado is said to have founded the castle[2][6]

  2. Dates vary by source

    The castle is surrendered to the Takeda general Akiyama Nobutomo[2][5]

  3. Oda Nobutada retakes the castle[2][5]

  4. Matsudaira Ienori becomes lord and the Iwamura domain is founded[4][5]

  5. The castle is abolished and its buildings dismantled[5]

  6. Named one of Japan's 100 Fine Castles[5]

Buildings and remains

The keep today

No keep was built

Listed with no keep by the Japan Castle Foundation; the main enclosure is said to have had two-story turrets rather than a keep.

The site today

The mountaintop is a ruin with no buildings, where enclosures, tall stone walls and wells remain. At the foot, on the lord's residence site, are the Iwamura History Museum and the rebuilt gate and drum turret. The ruins include both city-owned and other land.

Main buildings

Lost

Turrets and gates on the summit

Dismantled after the Meiji abolition; some gates survive at temples in town.[5]

Modern reconstruction

Front gate and drum turret at the lord's residence site

Rebuilt on the residence site (in wood in 1990, according to a secondary source).[3][5]

Key facts

Type
Castle
Setting
Mountain castle (yamajiro)built on a mountain; expect a climbEditorial article
Period
Medieval (c.1185–1570s), Early modern (1570s–1871)Editorial article
Keep (tenshu)
No keep was builtthe castle never had a keepEditorial article
Built by
Matsudaira Ienori, Kawajiri Hidetaka, Katou Kagekado, Tōyama clan, Tōyama KagetomoJapan Castle Foundation
Built
1185Japan Castle Foundation
Main lords
Niwa clan, Matsudaira clan, Mōri clan, Ogyū-Matsudaira clan, Akiyama clan, Tōyama clanJapan Castle Foundation
Abandoned
1871Wikipedia (ja)
Remains to see
Stone walls, Baileys / enclosures (kuruwa), Wells, Gates, Fortified gateways (koguchi)Editorial article
Designation
Gifu Prefectural Historic Site (Iwamura Castle ruins)Editorial article
Selection
Japan's 100 Fine Castles No. 47Japan Castle Foundation

Visiting

Access

Open to visitors

The ruins on the mountain are open to visit. The main enclosure, east enclosure, outer bailey (demaru) and six-tier wall are city land where no permit is needed to take photos (drone flights should be reported in advance to the city's Culture Division). Other parts belong to private landowners. The Japan 100 Castles stamp location is not confirmed.

Address

Shiroyama, Iwamura-cho, Ena, Gifu[5]

Checked: 2026-10-03

Nearest stations and how to get there

Iwamura Station (Akechi Railway)Akechi Railway (change from the JR Chuo Line at Ena Station)

about 40 min walk · Steep climb

About 20 minutes on foot from the station to the Iwamura History Museum, then about 20 minutes up the mountain path to the main enclosure.[3]

Checked: 2026-10-03

Hours and admission

Iwamura History Museum
Hours
April–November 9:00–17:00; December–March 9:30–16:00
Closed
Mondays (if a holiday, the following two days), the day after a holiday, and December 28 – January 4. Closures after Golden Week vary by year.
Admission
Adults 300 yen, 65 and over 200 yen, high school students and younger free[3]
Checked: 2026-10-03

By car / parking

About 20 minutes from the Ena IC on the Chuo Expressway via Route 257 to the Iwamura History Museum (parking available, including for large buses).[3]

Checked: 2026-10-03
Grounds opening hours
Not confirmedChecked: 2026-10-03
Time neededEditors' estimate
About 2–2.5 hours for the round trip from the museum to the summit, including looking around.
Steps, slopes and footing
The main enclosure is on a 717 m summit, about 20 minutes' climb by mountain path from the foot.[3][4]
Wheelchairs and strollers
Not confirmedChecked: 2026-10-03
Toilets and rest
Not confirmed
English signs / audio guide
The local group Hot Iwamura publishes an English guide PDF. English signage on site is not confirmed.[2]
Seasons
Mist often wraps the mountain around rainy weather.[2]
Photography
No permit is needed to photograph city land (main enclosure, east enclosure, outer bailey, six-tier wall, etc.), even for publication. Report drone flights to the city's Culture Division in advance. Other land depends on the owner.[4]
Works, closures and restrictions
The Iwamura History Museum closed September 24–28, 2026, for an exhibition change (now over). Check the city page for current notices.[3]Checked: 2026-10-03

Around the castle

Editors' guide

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

Who will enjoy it

For those who don't mind a mountain walk, who enjoy the sheer scale of stone walls even without buildings, and who are drawn to the Sengoku story of the 'woman lord'.

What makes it interesting

At the summit, look for the walls rising in tiers around the main enclosure. At the foot, the Edo-period castle drawings in the museum make it easier to picture the layout once you are up top.

Before you go

Reaching the main enclosure takes about 20 minutes uphill on a mountain path, and there are no buildings at the top. The museum closes on Mondays and the day after holidays. Mist is common, so watch your footing.

Ways to enjoy it

Walk the old merchant street, prepare at the museum, then climb: you will see town, lord's residence and mountaintop castle as one connected whole.

Photos

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Open questions

Sources

  1. 1
    恵那市の城館跡(県史跡岩村城跡)恵那市教育委員会 文化課municipalChecked:
  2. 2
    岩村城跡城下町ホットいわむらtourismChecked:
  3. 3
    岩村歴史資料館恵那市教育委員会 文化課municipalChecked:
  4. 4
    指定文化財の保存と活用恵那市教育委員会 文化課municipalChecked:
  5. 5
    岩村城(補助資料)Wikipedia日本語版otherChecked:
  6. 6
    日本100名城 一覧公益財団法人日本城郭協会jokakuChecked:
  7. 7
    史跡(岩村城跡・歴史資料館ほか)城下町ホットいわむらtourismChecked:
  8. 8
    List of Japan's 100 Fine Castles and the Next 100公益財団法人日本城郭協会jokakuChecked:
  9. 9
    Wikipedia「岩村城」Wikipedia日本語版wikipediaChecked:
  10. 10
    Wikidata Q1196356WikidatawikidataChecked:
  11. 11
    OpenStreetMap node/1948821501© OpenStreetMap contributors (ODbL)osmChecked:

Listing status

  1. Candidate foundChecked
  2. Confirmed as a castle siteChecked
  3. Basic informationChecked
  4. In-depth articleChecked
  5. Photo rights checkedChecked
  6. Visit info checkedChecked

Castles nearby

Ibamahama Castle4 km · Not yet confirmedAgi Castle4.7 km · Not yet confirmedAkechi Castle8.1 km · Not yet confirmedAkechi Jin'ya8.2 km · Not yet confirmedSendanbayashi Castle11 km · Not yet confirmedOi Castle11 km · No keep recorded

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