Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
SoufreSulfuresSulfates
Niseko Goshiki Onsen Ryokan is a thermal facility in Niseko, on the island of Hokkaido. Its sulfurous, slightly acidic water (pH 6.5) emerges at around 44 °C (111 °F). The ryokan offers an indoor bath, a rotenburo-style outdoor bath and a sauna.
Insider tip — Niseko Goshiki Onsen Ryokan sits at the foot of Mount Yotei in one of Hokkaido's premier volcanic onsen areas. The name Goshiki means five colors, referring to how the sulfurous water changes hue depending on oxidation and temperature. Outdoor rotenburo pools frame views of the surrounding powder-snow forest in winter, and wildflower meadows in summer. Guests can alternate between the hot spring bath and cold plunge to heighten the circulatory benefit.