Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
SoufreSulfuresSulfates
Nikko Ogurayama Onsen; Shungyotei Yurin, an onsen in Nikkō, Tochigi, offers a soak in thermal sulfurous water at 55°C, alongside an outdoor bath (rotenburo) and a sauna.
Insider tip — 'Shungyotei Yurin' (spring-dawn pavilion in the forest) at Ogurayama Onsen offers a ryokan-style hot spring experience in the wooded mountains around Nikkō. A refined atmosphere that complements the baroque splendour of Tōshō-gū shrine — a complete cultural and thermal immersion in Tochigi's most celebrated landscape.