Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
BicarbonatesSodiumCalcium
Fukumitsu Onsen is a gentle hot spring in the Fukumitsu area of Nanto city, Toyama Prefecture, situated in the agricultural lowlands where the Shogawa and Shotani rivers converge before flowing north toward Toyama Bay. The bicarbonate mineral waters are valued for their skin-softening and anti-inflammatory properties, providing quiet, accessible thermal relaxation in a part of Toyama that is rarely visited by international tourists yet harbors authentic rural traditions of rice cultivation, sake brewing, and seasonal festival culture. The surrounding flat farmland and wooded riverbanks give Fukumitsu Onsen an unhurried, genuinely local character that rewards the adventurous traveler willing to explore beyond the well-worn onsen circuit.
Insider tip — Fukumitsu Onsen lies in the flatlands of the Nanto basin where Toyama's traditional crafts culture — silk, lacquerware, and bronze — developed over centuries. The bicarbonate water at 41°C is comfortably warm and notably soft on the skin. Local day-spa facilities draw families from across the basin who treat bathing as a weekly social ritual. The agricultural surroundings, with views toward the Hida highland rim, make for a deeply rural and grounding experience.