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Moroyama Onsen

Moroyama, Saitama Prefecture, Japan
Moroyama Onsen
Location
Moroyama, Saitama Prefecture, 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

Moroyama Onsen is located in Moroyama Town, Saitama Prefecture, in the western Saitama uplands near the Musashino plateau edge where forested hills, small reservoirs, and the natural landscape of the outer Kanto highland region provide a greener and quieter environment than the urban zones of the Saitama interior. The siliceous thermal waters here serve a small residential community in the western Saitama foothills, providing mineral spring bathing in a rural-suburban transitional zone where the natural character of the Musashino landscape has been better preserved than in the more densely developed central Saitama plain. These onsen offer residents of western Saitama a locally accessible hot spring resource set within a more natural landscape, combining therapeutic mineral spring bathing with the gentle woodland scenery of the Saitama upland that serves as a green buffer between the Kanto plain and the mountains of the outer Tokyo metropolitan zone.

Insider tip — Moroyama Onsen lies in the western foothills of Saitama where the Kanto Plain meets the Musashino terrace, drawing amber sodium-chloride water from deep strata that carry traces of ancient marine deposits. The surrounding Moroyama area is unusually green for greater Tokyo's orbit, with tea plantations and forested trails rarely visited by tourists. The onsen functions as a hiker's basecamp as much as a neighbourhood bath.
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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).