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Komae Onsen Tokyo

Komae, Tokyo Metropolis, Japan
Komae Onsen Tokyo
Location
Komae, Tokyo Metropolis, Japan
Water type
bicarbonate
Temperature
40 °C
pH
8

Water profile

Thermicity
Sedative
40 °C
LowHigh

Relaxing — deep, immediate muscle release.

Mineralisation
Restorative
LowHigh

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

Buoyancy
Standard buoyancy
LowHigh

Soft water — natural, classic buoyancy.

BicarbonatesSodiumCalcium

Komae, the smallest city by area in Tokyo Metropolis on the southern bank of the Tama River bordering Kawasaki, is a compact riverside community of over 80,000 residents whose charming Tama River waterfront, traditional kofun burial mound heritage — Komae has one of the highest concentrations of ancient burial mounds in the entire Tokyo metropolitan area — and quiet residential atmosphere create an appealingly intimate urban spa setting. Komae Onsen Tokyo draws on sodium and bicarbonate thermal waters from the geological resources of the Tama River alluvial zone, providing warm restorative baths in this small but historically rich riverside city whose kofun burial mound heritage reflects the deep history of human settlement along the ancient Tama River corridor. The Komae kofun burial mound complex and local history museum, the Tama River cycling and walking path along the scenic river levee, and the easy Odakyu Line access to both Shinjuku and Odawara create a compact and surprisingly historically rich spa destination along the Tama River in Tokyo Metropolis.

Insider tip — Komae is Tokyo's smallest city by area, wedged between the Tama River and Setagaya ward, yet it punches above its weight with a sento known for unusually smooth bicarbonate water drawn from deep Pleistocene layers. The bath is a fixture of the close-knit neighbourhood fabric where residents know each other by name across the tile divider. At 40°C the alkaline water acts as a gentle cleanser, leaving skin notably polished after even a brief 20-minute soak. The Tama River embankment is a fine spot for a cool-down stroll after bathing, with gravel beaches popular with local families.
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Frequently asked questions

How hot is the water?
The water runs quite hot here, around 40 °C — a sedative water that brings immediate muscle release.
What type of water is found here?
This spot features bicarbonate water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année (idéal automne-hiver).