Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
FerBicarbonatesManganèse
Bonneville Hot Springs Resort, in North Bonneville, Washington, offers iron-rich water at 38°C. An indoor bath, an outdoor rotenburo-style pool, a sauna, and massage come together on the banks of the Columbia River.
Insider tip — Bonneville Hot Springs Resort occupies a forested site in the Columbia River Gorge National Scenic Area, just downstream from Bonneville Dam. The resort channels geothermal water at around 100°F through a series of indoor and outdoor pools within a full-service spa facility. The Gorge setting means dramatic basalt cliffs and lush Pacific Northwest forest surround the property. Reserve treatments well in advance as the spa is popular with Portland day-trippers.