Bathing
Rotenburo · Indoor bath · Sauna · Cold bath
Japan's hot springs — in full detail
Thousands of onsensMapped in full detail
The deepest catalog of Japanese onsen — the most advanced map in Japan, every facet recorded, a community of bathers, and a passport that earns you badges as you go.
2,559+Onsen catalogued
47Prefectures
30+Facets per place
37Badges to earn
Swing
A swing inside the bath — ride out over the water.
Cave bath
A bath carved into a natural cave or grotto.
Electric bath
A weak current massages the muscles — a Showa-era curiosity.
Mud bath
Soak in mineral mud, a Beppu specialty.
Sand bath
Buried under heated mineral sand, beside the sea.
Drinking spring
A tap of source water you can drink for health.
Depth
More known per onsen than anywhere else
Bathing types, water source, sauna, tattoo policy, day-use hours, kashikiri — plus a vocabulary of rare highlights from kakenagashi water to konyoku mixed bathing.
Water
Onsen water · Kakenagashi
Capabilities
Kashikiri · In-room onsen · Konyoku
Policies
Tattoo · Kids
Services
Restaurant · Washing · Towel rental · Rest area · Parking
Highlights
Cave · Swing · Boat · Mud · Sand · Electric · Drinking · Ganbanyoku · Steam · Jet · Foot · Utaseyu · Nuruyu
Hand-picked
A few we keep coming back to
Real onsen, real photos. Tap any card to open the page.
Reviews & ratings
Five-star ratings and written notes from people who actually went.
Photos from the bath
From lobby signs to the bath itself — uploaded by visitors.
Curated by hand
Every submission and edit checked by a moderator before it goes live.
Hundred soaks
100 onsen visited.
All 47 prefectures
An onsen in every prefecture of Japan.
All eight regions
From Hokkaidō to Okinawa.
Thousand reviews
Wrote 1,000 reviews.
Hitō Society
Member of Japan's Hidden Springs Association.
Kusatsu Sanyū
All three sotoyu of Kusatsu.
Kinosaki Sotoyu
All seven public baths of Kinosaki, in yukata.
Nozawa 13
All thirteen sotoyu of Nozawa, sealed.
Beppu Onsen-dō Meijin
Master of Beppu's onsen way.
Wakayama 12-Tō Meister
Master of Wakayama's twelve baths.
Kyūshū 88-Sennin
The eighty-eight saints of Kyūshū's hot springs.
Onsen Tamago-dō Meijin
Master of the way of eggs cooked in onsen water.
Wakayama 12-Tou
An official onsen pilgrimage across Wakayama Prefecture organised by the Wakayama Travel Industry Cooperative. Collect stamps from each of the 12 onsen areas in your juntoucho booklet to earn the Mastery Card.
Kusatsu Sanyū Meguri
Three municipal day-use bathhouses in Kusatsu Onsen — all pure source-water (源泉かけ流し). The wooden tegata pass has no expiration; visit at your own pace.
Kinosaki Sotoyu Meguri
Seven public bathhouses (sotoyu) in the willow-lined onsen town of Kinosaki on the Hyōgo coast. The town is the inn — walk between baths in yukata and geta.
