Mishima Onsen Niigata

Mishima, Niigata, Japan

Location: Mishima, Niigata, Japan
Water type: sodium chloride, 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

Effortless float

LowHigh

Dense, salty water — you float without effort.

SodiumChloruresBrome

Mishima Onsen in the Nagaoka area of Niigata Prefecture flows from deep beneath the rice paddies of Japan's renowned snow country, where heavy precipitation feeds both agriculture and the local spa tradition. The sodium-bicarbonate composition makes the water notably smooth against the skin, traditionally recommended for recovering from physical labour in the fields and mountains. Small neighbourhood bathhouses here attract locals year-round, especially during the bitter winters when the warmth of the mineral waters provides essential comfort in this climatically demanding region.

Insider tip — Mishima in Niigata Prefecture occupies a quiet inland valley between the Sea of Japan coast and the Echigo mountain range, where sodium-bicarbonate springs at 40 °C welcome rice farmers and local residents year-round. The area receives some of Japan's heaviest snowfall, making the outdoor rotenburo an intense sensory experience when bathing in falling snow against white-blanketed rice terraces. The slightly alkaline water leaves skin noticeably smooth after a single soak. Nagaoka city is known for its spectacular summer fireworks festival, drawing visitors who combine both seasonal highlights.

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