Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
BicarbonatesSodiumCalcium
Nishitonami Onsen in Nanto city, Toyama Prefecture, lies within one of Japan's largest municipalities by area, a sprawling city that encompasses ancient villages, mountain gorges, and the deeply forested Gokayama valley, a UNESCO World Heritage Site famed for its gassho-zukuri farmhouses whose steeply pitched thatched roofs resemble hands pressed together in prayer. The sodium-bicarbonate spring water provides smoothing, alkaline baths that have traditionally supported the farming communities of this mountainous inland area, where the heavy snowfall of up to four metres annually creates both a spectacular winter landscape and a physically demanding seasonal lifestyle. Bathing in Nishitonami's mineral waters connects visitors to the slow rhythms of one of Japan's most beautiful and culturally preserved mountain regions.
Insider tip — Nishitonami Onsen serves the western Tonami area of Toyama, a quiet agricultural district of broad rice paddies and windbreak zelkova trees that are iconic to this region. The bicarbonate waters flow at a steady 40°C and the bathhouse is known for its unpretentious character, drawing residents from surrounding farming communities. The spring's high bicarbonate content leaves skin notably smooth, prompting many visitors to make it a weekly ritual.