Nangu Onsen

Ena, Gifu, Japan

Location: Ena, Gifu, Japan
Water type: sulfurous, iron-rich
Temperature: 44 °C
pH: 6.5

Water profile

Thermicity

Sedative

44 °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

Nangu Onsen in Nagano Prefecture offers a combination of sulfurous and ferruginous waters—a spring of dual mineral intensity that carries both the volcanic character of hydrogen sulfide compounds and the iron mineral richness that colors its waters, creating a spring of distinctive character in the Japanese thermal tradition where mineral combinations are prized above single-mineral springs. Nagano's volcanic landscape produces springs of remarkable mineral diversity across its many highland valleys and mountain passes, and Nangu's sulfurous-ferruginous character reflects the complex geology of a prefecture where multiple types of volcanic and hydrothermal activity converge. This spring's combined mineral profile makes it one of Nagano's more assertive volcanic spring discoveries for those seeking the most direct engagement with the prefecture's geological wealth.

Insider tip — Nangu Onsen combines sulfurous and iron-rich (ferruginous) waters in the Ena highlands of southeastern Gifu, where two distinct geological formations intersect to produce a complex multi-mineral spring. The iron content stains the bath surrounds a distinctive ochre-rust. Located near Nangu Taisha, one of the great shrines of the Tokai region, the onsen has long served pilgrims and travelers. The combined sulfur-iron chemistry is particularly valued in Japanese bathing tradition for its soothing effect on the skin.

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