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Itabashi Onsen

Itabashi, Tokyo, Japan
Itabashi Onsen
Location
Itabashi, Tokyo, Japan
Water type
sodium chloride
Temperature
41 °C
pH
7.3

Water profile

Thermicity
Sedative
41 °C
LowHigh

Relaxing — deep, immediate muscle release.

Mineralisation
Restorative
LowHigh

Loaded with major ions — the essential minerals (Ca, Mg).

Buoyancy
Effortless float
LowHigh

Dense, salty water — you float without effort.

SodiumChloruresBrome

Itabashi Onsen is a community thermal facility in Itabashi Ward in northern Tokyo, a historically significant ward whose name—meaning 'board bridge'—recalls the wooden bridge that made this point on the Shakujii River a crucial waypoint on the Nakasendo highway connecting Edo with Kyoto, making Itabashi-juku one of the first post towns encountered by travelers leaving the shogunate capital for the western provinces. The siliceous mineral waters provide daily bathing for a densely populated urban ward whose traditional shitamachi (low city) character—street-level shotengai shopping arcades, local festivals, neighborhood temples, and the Itabashi Ennichi summer festival—maintains the informal communal spirit of old Tokyo neighborhood life. The Shakujii Park's forested ponds, the 4-kilometer Itabashi Green Road pedestrian promenade, and the warm mineral waters of this community onsen reflect the ward's determination to preserve Tokyo's historic neighborhood character in the face of continuous urban renewal.

Insider tip — Itabashi Ward occupies the northwestern corner of Tokyo proper, bordering Saitama Prefecture, and retains a gritty, unpretentious character that long-time residents cherish. The sento draws the deep dark-water sodium-chloride thermal springs of the Kanto basin, and its modest, functional design is a holdover from the shitamachi bathhouse tradition. The nearby Arakawa River embankment offers flat cycling paths and seasonal flower displays that pair well with an early-morning soak.
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Frequently asked questions

How hot is the water?
The water runs quite hot here, around 41 °C — a sedative water that brings immediate muscle release.
What type of water is found here?
This spot features sodium chloride water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année (idéal automne-hiver).