Kusanagi Onsen

Yamagata, Yamagata, Japan

Location: Yamagata, Yamagata, Japan
Water type: thermal
Temperature: 41 °C
pH: 7.3

Water profile

Thermicity

Sedative

41 °C

LowHigh

Relaxing — deep, immediate muscle release.

Mineralisation

Balancing

LowHigh

Rich in trace elements — gentle on the skin.

Buoyancy

Standard buoyancy

LowHigh

Soft water — natural, classic buoyancy.

BicarbonatesCalcium

Kusanagi Onsen shares its name with the legendary Kusanagi no Tsurugi—the Grass-Cutting Sword, one of Japan's three imperial treasures, said to have been discovered within the body of the eight-headed dragon Yamata no Orochi by the god Susanoo and later enshrined at Atsuta Jingu in Nagoya—a name of the highest mythological significance in the Japanese Shinto tradition. Simple alkaline waters offer the gentle, skin-softening mineral soak that defines Japan's most universally welcoming thermal springs, connecting the mythological grandeur of the spring's name to the democratic simplicity of a bath accessible to all who come to the volcanic waters of the Japanese earth. A spring bearing the name of one of Japan's sacred imperial regalia carries with it the full weight of Shinto mythology, making even a simple mineral soak feel connected to the deepest roots of Japanese civilization.

Insider tip — Kusanagi Onsen flows in the Yamagata basin in the shadow of Zao volcano, where clear alkaline spring water at 41°C surfaces from deep Tohoku basement rock and serves the surrounding agricultural community as a year-round wellness retreat. The onsen's name — Grass-Cutter Spring — evokes its ancient role as a rest stop for farmers. Facilities are modest and traditional, prioritising the bath experience. The Yamagata basin's cherry blossom season and premium La France pears add seasonal context to a soothing soak.

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