The onsen — a natural hot-spring bath — is one of Japan's deepest pleasures and one of its most intimidating rituals for newcomers. Communal, unclothed bathing runs against many visitors' instincts. But the etiquette is simple once learned, and the reward is one of the most restorative experiences in the country.
The basic sequence
Every onsen follows the same rhythm. Undress fully in the changing room (swimsuits are not worn). Enter the bathing area with only a small towel. Sit at one of the washing stations and clean yourself thoroughly — this is the crucial step; you enter the shared bath already clean. Rinse off all soap, then ease slowly into the hot water to soak. The bath is for relaxing, never for washing.
On tattoos
Historically many onsen barred tattoos due to their association with organised crime. Attitudes are shifting, especially in tourist areas, but rural baths may still refuse entry. Options: look for tattoo-friendly onsen (increasingly common and often advertised), cover small tattoos with waterproof patches, or book a private family bath (kashikiri-buro) where the whole issue disappears.
Public bath, private bath
If communal bathing feels like too much for a first attempt, many ryokan inns and some day-spas offer private baths you can reserve by the hour. Some rooms even come with their own open-air bath. This is a gentle on-ramp — the same mineral water, none of the social exposure.
Reading the water
Different springs carry different minerals — iron-rich waters run rust-brown, sulphur springs smell of egg, sodium-bicarbonate waters leave skin silky. Signs usually list the water's composition and claimed benefits. Part of the pleasure of onsen travel is collecting these different waters the way others collect views.
Find hot-spring towns near the mountains in our Kiso Valley walking guide.