Dairizuka Kofun Group, Inariyama, Futtsu City
Article

12226 / ふっつし

Chiba Prefecture

Futtsu City

Eight mounds form one national site.

Dairizuka Kofun Group, Inariyama

Photo by ja:user: のりまき (CC BY 3.0)

01 / Quarry

In 1958, when chainsaws arrived,a stonecutter's daily output grew tenfold.

Quarry in Futtsu City
Photo by ערן (CC BY-SA 4.0)

Mount Nokogiri is made of tuffaceous sandstone called Boshu stone, and quarry remains survive on the Futtsu side. According to the city, after chainsaws were introduced in 1958 (Showa 33), a stonecutter's daily output rose tenfold, from 8 to 10 pieces to 80 to 100. Quarrying ended in 1985 (Showa 60).

  • Boshu stone is tuffaceous sandstone
  • Chainsaws introduced in 1958
  • Quarrying ended in 1985

02 / Cave tombs

On the wall of Tomb No. 1,the words "Daido first year" appear.

The Kinu cave tomb group opens on a hillside slope in the Iwase River basin, with 11 tombs confirmed. Tomb No. 1 bears the characters for "Daido first year" and "Kose" on its wall, and Tomb No. 10 bears "Ki". The city notes that Kose and Ki point to the Kose and Ki clans, drawing attention to their ties with those buried.

  • 11 tombs
  • Daido 1 is 806
  • Prefectural historic site (1966)

03 / Daikyotetsu

Said to be pulled from the sea,the 160 cm iron disc is not a mirror.

The Daikyotetsu, the sacred object of Kanaya Shrine, is said in the shrine's tradition to have been pulled from the sea 550 m west of the shrine in 1469. It is 160 cm across, weighs 1.571 tons and is split in two. Its name is said to come from Yamato Takeru's mirror, but it is not actually a mirror. It is a prefecturally designated archaeological material.

  • 160 cm across
  • 1.571 tons
  • Prefectural designation (1966)

Futtsu City from the sky

Now and 1974–78. Tap a photo to zoom in.

Wide (about 6 km across)

Close (about 1.5 km across)

Now (shot October–November 2024)Shot 1974–78

Source: Geospatial Information Authority of Japan (GSI) GSI Tiles(全国最新写真(シームレス)/国土画像情報(第一期:1974〜1978年撮影))

Open in GSI Maps (now)Open in GSI Maps (1974–78)

Living here

71 minutes from Tokyo Station by highway bus.

  • about 40,000 people
  • 90 min to a city centre

Nitto Kotsu's Boso Nanohana highway bus takes 71 minutes from Tokyo Station Yaesu South Exit to Kazusa-Minato Station-mae in the city, on a daily trip via local roads (timetable revised 12 December 2025). The city advises that, by train, the nearest is JR Uchibo Line Onuki Station, about a 20-minute walk to City Hall.

People living here
42,465people
19952020

−6.9% since 2015

54,273 → 42,465

Area
205.4km²

83.17km² of it habitable

2024

Households
17,830households

2.4 people per household

2020

Rent (average for rentals)
46,046yen

National average 60,630 yen

2023

Healthcare
3 hospitals / 29 clinics

7.5 per 10,000 people

2023

Area205.4km²Habitable land83.17km² / 40%
Area and habitable land at the same scalee-Stat B1101 / B1103
Children waiting for childcare
—10 nurseries and similar
Home purchase subsidy
—
Average annual temperature
—

These 3 items are waiting on a nationwide data source. We do not fill them with estimates.

ACCESS

Where you can go from here.

Futtsu City in Japan35.304°N 139.857°E
OsakaFuttsu City
Onuki Station
大貫駅2022
  • to TokyoHighway bus71min

Travel times follow 日東交通の『白浜・館山~東京線(房総なのはな号)』(https://www.nitto-kotsu.co.jp/jn/・時刻表PDF 20251212bouso.pdf。『時刻:2025年12月12日改正』。運行は『全日』。ジェイアールバス関東と日東交通の共同運行)の【下り】で、東京駅八重洲南口の発と、富津市内の一般道の停留所『上総湊駅前』の着を数えた。3号(7:20発→上総湊駅前8:31着)・9号(10:20→11:31)・11号(11:20→12:31)・13号(12:20→13:31)・17号(14:20→15:31)・21号(16:20→17:31)・25号(18:20→19:31)・31号(21:20→22:31)がいずれも71分。同じ便は国道富津浅間山に69分、国道竹岡に77分で着く。**一般道を走るのは一部の便だけで(富津市公式『高速バス時刻表』『一部の便は一般道を走行し、国道竹岡から上総湊駅前から国道富津浅間山を経由』)、ほかの便は『富津浅間山バスストップ』に停まる(市公式の時刻表の表記は『国道』が付かない別の停留所。高速道路の上かは確かめていないので採らない)** (checked 2026-10-22). They vary by time of day.

Shape

Borders 3 municipalities.

Territory of Futtsu City
Boundaries: National Land Numerical Information (Administrative Area Data), MLIT. Processed by Machigatari.Lakes: National Land Numerical Information (Lake Data), MLIT. Processed by Machigatari. Prepared with the approval of the Director-General of the Geospatial Information Authority of Japan, using its Digital Map 25000 (Spatial Data Framework) and Digital Map 25000 (Place Names and Public Facilities). (承認番号 平27情使、第585号)

North to south

24.4km

Futtsu City isthis kind of town.

  1. 01Dairizuka Kofun Group lies on lowland near the mouth of the Koito River; eight mounds, Dairizuka Kofun plus seven nearby, became one national historic site through an additional designation in 2025
  2. 02The quarry remains on the Futtsu side of Mount Nokogiri are where Boshu stone was cut; chainsaws were introduced in 1958 and quarrying ended in 1985
  3. 03On the wall of Kinu Tomb No. 1 are the characters for "Daido first year", and the Daikyotetsu of Kanaya Shrine is said in tradition to have been pulled from the sea in 1469

If something caught your eye, ask the town itself.

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