Shiroishi Zao Onsen Fujiya

Shiroishi, Miyagi, Japan

Location: Shiroishi, Miyagi, Japan
Water type: sulfurous
Temperature: 42 °C
pH: 6.5

Water profile

Thermicity

Sedative

42 °C

LowHigh

Relaxing — deep, immediate muscle release.

Mineralisation

Bio-active

LowHigh

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

Buoyancy

Standard buoyancy

LowHigh

Soft water — natural, classic buoyancy.

SoufreSulfuresSulfates

Shiroishi Zao Onsen Fujiya is found in Shiroishi City at the southern gateway to Miyagi Prefecture, a historic castle town whose distinctive jujitsu school, the Shiroishi Domain's Katakura clan martial arts tradition, and preserved samurai heritage make it one of Tohoku's most atmospheric historical communities outside the great cities. The city sits at the foot of the Zao mountain range, the volcanic massif shared between Miyagi and Yamagata prefectures that is most famous for its extraordinary juhyo phenomenon — the frost-encrusted snow monsters formed when wind-driven ice crystals coat the snowbound trees in bizarre organic sculptures that are illuminated at night in winter to create one of Japan's most otherworldly natural spectacles. The sulfurous thermal waters here, drawing on Zao's volcanic geothermal resources, warm visitors who come to witness the winter ice formations and to explore the historical depth of a samurai castle town that has preserved its Edo-period character with exceptional care.

Insider tip — Shiroishi sits at the southern foot of Mount Zao, one of Tohoku's most active volcanic massifs, and its onsen draws on the potent sulfurous waters that have sculpted the legendary Okama crater lake above. The pale milky-white waters at 42°C carry a sharp sulfur aroma — a hallmark of genuine volcanic spring activity — and are traditionally credited with exceptional skin-smoothing properties. The Zao Foxes Village nearby and spectacular winter snow monsters make this a year-round destination.

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