Kosai no Yu has as many as six baths, an impressive number, especially when you consider five of them are outdoor.
The facility has an intriguing structure. It is built on a slope, with the various baths spread out on a vast surface and connected through mood-evoking roofed wooden corridors. Thanks to its elevated position at about 1,280m, you can relish amazing views of the Japanese Alps while soaking in the onsen.
If you feel somewhat uncomfortable at bathing with strangers, you will be happy to know that here you will also find one private open-air bath.
This is one of the places that feature the Mimuro Gensen spring water, which is considered very effective against muscle pains and atopic dermatitis.