Nanto’s sauna base equipped with state-of-the-art IKI sauna
Toyama Nanto City
"37BASE" is a bathing facility in Nanto City, Toyama Prefecture, that opened in December 2023. The former Horinji Onsen site was completely renovated and transformed into a modern relaxation spot with sauna at its core. On the men’s side, there is a sauna equipped with a massive iki stove and auto-löyly, while the women’s side features a bouna sauna known for its pleasantly soothing steam. In addition, the cold plunge bath with free-flowing natural water pumped up from underground leads sauna-goers to a supreme state of totonou.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity10people
An authentic sauna featuring a massive Finnish-made iki stove. Auto-löyly is installed, and the powerful steam that rises at regular intervals quickly and pleasantly fills the room with heat. In this stylish space, you can enjoy a high-quality sweating experience.
Water QualityNatural Water (Groundwater, Spring, etc.)
Capacity2people
Luxuriously uses natural water pumped up from underground in a free-flowing system. It features a stable cool temperature of around 15°C year-round and the smooth, gentle feel unique to natural water. It instantly tightens the body after sauna use and delivers an exceptional cooling-down experience.
Closed Days: None
〒932-0203 Iwaya 16-1, Nanto City, Toyama Prefecture
Gender Access
Gender Separated
Curated by an expert who visits onsen and sauna facilities every day and has explored 300+ locations — only facilities confirmed to be truly exceptional are featured.
Learn more
Nanto’s sauna base equipped with state-of-the-art IKI sauna
Toyama Nanto City
"37BASE" is a bathing facility in Nanto City, Toyama Prefecture, that opened in December 2023. The former Horinji Onsen site was completely renovated and transformed into a modern relaxation spot with sauna at its core. On the men’s side, there is a sauna equipped with a massive iki stove and auto-löyly, while the women’s side features a bouna sauna known for its pleasantly soothing steam. In addition, the cold plunge bath with free-flowing natural water pumped up from underground leads sauna-goers to a supreme state of totonou.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity10people
An authentic sauna featuring a massive Finnish-made iki stove. Auto-löyly is installed, and the powerful steam that rises at regular intervals quickly and pleasantly fills the room with heat. In this stylish space, you can enjoy a high-quality sweating experience.
Water QualityNatural Water (Groundwater, Spring, etc.)
Capacity2people
Luxuriously uses natural water pumped up from underground in a free-flowing system. It features a stable cool temperature of around 15°C year-round and the smooth, gentle feel unique to natural water. It instantly tightens the body after sauna use and delivers an exceptional cooling-down experience.
Closed Days: None
〒932-0203 Iwaya 16-1, Nanto City, Toyama Prefecture
Gender Access
Gender Separated
Curated by an expert who visits onsen and sauna facilities every day and has explored 300+ locations — only facilities confirmed to be truly exceptional are featured.
Learn more