Article

12237 ／さんむし

Sanmu City

A wetland where leaf hairs trap insects.

Naruto-Togane Carnivorous Plants

01 ／ Railway

The founder of the Sobu Railwaydied at 35, five months before service began.

Yasui, born in Naruto, founded the Sobu Railway Company in 1889 (Meiji 22). He died at 35 in February 1894, five months before service began between Ichikawa and Sakura. Naruto Station, long awaited by townspeople, opened in 1897. His birthplace and grave are city-designated.

Founded the Sobu Railway in 1889
Died at 35, five months before service
Naruto Station opened in 1897

02 ／ Tumulus

A 115 m keyhole-shaped tumulushas no haniwa and a triple moat.

Otsutsumi Gongenzuka Tumulus is a keyhole-shaped tumulus about 1 km west of JR Matsuo Station, 115 m long. The city says it has a triple moat (confirmed in 1991) and a total length of 174 m, and is unusual: large yet without haniwa, with its front section facing south. It is a prefectural historic site.

115 m long
Triple moat
No haniwa

03 ／ Loom

The ritual flag loom, Izaribata,is thought made just after an 1689 fire.

The Izaribata of Hachiman Shrine is the loom used to weave the flag in the Ohata-ori ritual, and is a prefecturally designated folk cultural property. It is thought to have been made just after its head temple burned down in 1689 (Genroku 2), of cedar shaved with an adze. The flag is tied to a legend of Yoritomo's white flag, but the city calls that a later attachment.

Prefectural designation, 1967
Thought made just after the 1689 fire
Cedar shaved with an adze

Sanmu 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)

Shot 1974–78

Source: Geospatial Information Authority of Japan (GSI) GSI Tiles（国土画像情報（第一期：1974〜1978年撮影））

Open in GSI Maps (1974–78)

Living here

From Tokyo, 64 minutes by Limited Express Shiosai.

about 50,000 people
90 min to a city centre

The Limited Express Shiosai runs daily from Tokyo Station to Naruto Station, and the fastest takes 64 minutes (JR East timetable, October 2026). The city says about 70 minutes by limited express. Sammu City was formed in March 2006 by the merger of Naruto, Sammu, Hasunuma and Matsuo.

People living here: 48,444people
Area: 146.77km²
Households: 19,403households
Rent (average for rentals): 46,302yen
Healthcare: 1 hospital ／ 26 clinics

Area and habitable land at the same scalee-Stat B1101 / B1103

Children waiting for childcare: —8 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.

Sanmu City in Japan35.603°N 140.413°E

to TokyoLtd. exp. Shiosai64min

Travel times follow JR東日本の駅の時刻表（デジタル時刻表 2610版）の成東駅『下り』（timetable/tt1136/1136010.html＝平日、1136011.html＝土休日）と、各列車ページ（train/…）。docs/handoff/tools/jr_count.py を『毎日』だけに絞って回し、東京の発→成東の着を列車ごとに数えた。平日・土休日の両方に同じ分数で載り、列車ページの『運転日』が空の列車だけ。2026-10-22 取得 (checked 2026-10-22). They vary by time of day.

Shape

Borders 6 municipalities.

Territory of Sanmu 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

15.7km

Togane City, Yokoshibahikari Town, Yachimata City, Tomisato City, Kujukuri Town, Shibayama Town

Sanmu City isthis kind of town.

01The Naruto-Togane Carnivorous Plant Colony is a wetland along a river where plants trap insects with leaf hairs, or with traps underground
02Yasui, founder of the Sobu Railway, died at 35, five months before service began; his birthplace and grave are city-designated
03Otsutsumi Gongenzuka Tumulus has no haniwa and a triple moat, and Hachiman Shrine's Izaribata is thought made just after an 1689 fire

If something caught your eye, ask the town itself.

Sanmu City official site ↗Wikipedia ↗

From this town's themes