A skin-beautifying hot spring nurtured by fossil seawater from 4.5 million years ago, and a sophisticated healing space filled with jazz
Niigata Niigata City
"Akiba Onsen Kanasui" is a modern and sophisticated day-use hot spring facility in Akiha Ward, Niigata City. The source spring, which gushes up from deep underground, is a rich sodium chloride bicarbonate spring whose main component is fossil seawater from about 4.5 million years ago, and it contains abundant minerals that leave the skin smooth and supple. The baths were designed with reference to spas in France and Germany, and you can leisurely enjoy this famous hot spring in a calm space filled with jazz. It is equipped with a far-infrared sauna, and also has a low-temperature mist sauna. The cold plunge bath, chilled sharply by a chiller, is highly regarded by sauna enthusiasts as well.
TypeNatural Hot Spring
A sodium chloride bicarbonate spring (iodine-containing). A mineral-rich, light greenish-brown hot spring whose main component is fossil seawater from 4.5 million years ago. It is a famous hot spring known for its rich, skin-adhering bathing feel and the skin-beautifying effects of bicarbonate ions.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity10people
A far-infrared sauna is available. With no television and jazz playing quietly inside, this is an adult space where you can take your time, sweat deeply, and focus on yourself.
Sauna TypeMist Sauna
Capacity5people
A low-temperature mist sauna. Wrapped in moist steam, you can warm up slowly without putting strain on your body. It offers a high level of relaxation and is also recommended for those who are not fond of dry saunas.
Water QualityTap Water
Capacity3people
A full-fledged cold plunge bath with a depth of about 90 cm, kept constantly cold by a chiller. It rapidly and evenly cools down your overheated body after the sauna. A setting that satisfies sauna users who want a properly cold bath.
Closed Days: None
956-0833 1-4-5 Kusamizu-cho, Akiha Ward, Niigata City, Niigata Prefecture Akiba Onsen Kanasui
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
A skin-beautifying hot spring nurtured by fossil seawater from 4.5 million years ago, and a sophisticated healing space filled with jazz
Niigata Niigata City
"Akiba Onsen Kanasui" is a modern and sophisticated day-use hot spring facility in Akiha Ward, Niigata City. The source spring, which gushes up from deep underground, is a rich sodium chloride bicarbonate spring whose main component is fossil seawater from about 4.5 million years ago, and it contains abundant minerals that leave the skin smooth and supple. The baths were designed with reference to spas in France and Germany, and you can leisurely enjoy this famous hot spring in a calm space filled with jazz. It is equipped with a far-infrared sauna, and also has a low-temperature mist sauna. The cold plunge bath, chilled sharply by a chiller, is highly regarded by sauna enthusiasts as well.
TypeNatural Hot Spring
A sodium chloride bicarbonate spring (iodine-containing). A mineral-rich, light greenish-brown hot spring whose main component is fossil seawater from 4.5 million years ago. It is a famous hot spring known for its rich, skin-adhering bathing feel and the skin-beautifying effects of bicarbonate ions.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity10people
A far-infrared sauna is available. With no television and jazz playing quietly inside, this is an adult space where you can take your time, sweat deeply, and focus on yourself.
Sauna TypeMist Sauna
Capacity5people
A low-temperature mist sauna. Wrapped in moist steam, you can warm up slowly without putting strain on your body. It offers a high level of relaxation and is also recommended for those who are not fond of dry saunas.
Water QualityTap Water
Capacity3people
A full-fledged cold plunge bath with a depth of about 90 cm, kept constantly cold by a chiller. It rapidly and evenly cools down your overheated body after the sauna. A setting that satisfies sauna users who want a properly cold bath.
Closed Days: None
956-0833 1-4-5 Kusamizu-cho, Akiha Ward, Niigata City, Niigata Prefecture Akiba Onsen Kanasui
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