Japan onsens
HOSHINOYA Karuizawa
Hot springs in a Japanese mountain retreat
A nature-focused stay in Karuizawa with hot-spring bathing and riverside accommodation.
Karuizawa, Nagano · Japan
Visit websiteA world of naturally hot water
Blue Planet Hotsprings
Close to every hot spring on our planet, one hot soak at a time.
Discover · Soak · Explore
Discover the world’s
natural hot springs.
Onsen towns, thermal baths, wild river pools and beach springs — one world chart, endless places to soak.
Explore the world chart- Springs mapped
- —
- Countries
- —
- Hot springs & onsen
- Worldwide
- Access notes for everyone
- Free
Global coverage
The world chart
Loading springs…
Blue Planet network · Goods & services
Swim, move & unwind
Swimwear, yoga wear, hiking footwear, meditation retreats and onsens in Japan.
Independent selections, not confirmed sponsors. Images are illustrative, not brand products or photographs of the named retreats. Swimwear is for pools where permitted; Japanese onsen bathing rules vary.
Inside the directory
Recently added
Reach the Blue Planet community
Represent your brand.
Goods, services and destination experiences — put your business in front of travellers exploring naturally hot water.
Regional presence
Reach travellers across a selection of hot spring destinations.
Explore advertising plansWorldwide representation
Connect with the community across the world directory.
Explore advertising plans