Kabutoyu Onsen

Sagamihara, Kanagawa, Japan

Location: Sagamihara, Kanagawa, Japan
Water type: iron-rich
Temperature: 38 °C
pH: 6.3

Water profile

Thermicity

Neutral

38 °C

LowHigh

Soothing — neither hot nor cold, perfect balance.

Mineralisation

Bio-active

LowHigh

Rich in active gases or metals — a strong mineral character.

Buoyancy

Standard buoyancy

LowHigh

Soft water — natural, classic buoyancy.

FerBicarbonatesManganèse

Kabutoyu Onsen is a hot spring in Kanagawa Prefecture, the densely populated prefecture south of Tokyo that encompasses the historic cities of Kamakura and Yokohama, whose ferruginous mineral waters rich in iron compounds provide a distinctive bathing experience within the tradition of invigorating iron-bearing springs. Kanagawa Prefecture, despite being one of Japan's most urbanized regions, preserves pockets of natural landscape and thermal spring activity in its western mountain zone near the Tanzawa-Oyama Quasi-National Park, and Kabutoyu Onsen represents the survival of hot spring culture in an area experiencing intense suburban development pressure. The iron-rich waters of Kabutoyu Onsen are valued within Japanese bathing tradition and associated with vitality and well-being, making this a meaningful bathing destination within the greater Tokyo-Yokohama metropolitan area.

Insider tip — Kabutoyu Onsen draws iron-rich thermal water from beneath the Sagami Plain, presenting a distinctive amber-brown colour that signals its high mineral content. The ferrous-bicarbonate composition is prized for improving circulation and easing chronic fatigue, and the water leaves a subtle metallic warmth on the skin long after bathing. The bathhouse occupies a wooded plot and maintains a traditional sento layout with separate gender baths and a cedar-panelled rest room. Regular bathers swear by the water's effectiveness for cold hands and feet during the Kanto winter.

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