Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
SoufreSulfuresSulfates
In the traditional Japanese bathing culture, visitors follow a set of rules to maintain respect and cleanliness. Before entering the bathing area, individuals typically shed their clothing and wash their bodies thoroughly, often using a specific sequence of hot and cold water. They then rinse and proceed to soak in the hot springs, often in a communal setting, promoting relaxation and social bonding. Hair is usually tied back, and bathers wear minimal attire, such as towels or loincloths.
Insider tip — Yumori Onsen in the mountainous interior of Fukushima Prefecture is a deeply atmospheric hot spring village set beside a rushing river gorge. The sulfurous waters emerge at high temperature from volcanic fissures associated with the Azuma mountain range, carrying a classic eggy aroma and powerful warming effect. Several small ryokan line the gorge, each with private rotenburo perched above the rushing rapids below. Autumn foliage season transforms the valley into a tapestry of crimson and gold perfectly reflected in the steaming pools.