Wrapped in the golden-colored waters by the Shinano River. Proud of its Finland sauna and cold plunge bath
Niigata Tokamachi City
"Mion Nakasato" is a one-room inn at Miyunaka Onsen, surrounded by the vast rural landscape and the Shinano River in Tokamachi City, Niigata Prefecture. Its greatest pride is its brown, silky-smooth, gentle spring water, known as the "golden-colored bath." The abundant benefits of its sodium chloride hydrogen carbonate spring warm you to the core and leave your skin smooth. What impresses sauna enthusiasts most is the Finland sauna and the deep cold plunge bath with a depth of 1m (110cm), using well water. The uniquely designed cold plunge bath, with its spiral staircase structure, lets you cool down your entire body at once with a strong sense of buoyancy. The bathhouse has high ceilings and an open feel, and the open-air bath lets you enjoy the changing seasons with all five senses.
TypeNatural Hot Spring
A sodium chloride hydrogen carbonate spring. Its distinctive brown, clear golden water has a gentle, mildly alkaline feel on the skin. Long loved as a "skin-beautifying bath," it leaves you feeling warm for a long time even after you get out.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity20people
An authentic Finnish-style dry sauna. If you sit on the third tier, the distance to the ceiling is very short, allowing you to receive heat efficiently. With a spacious area that can accommodate more than 20 people, you can enjoy a long, relaxing sweat.
Water QualityNatural Water (Groundwater, Spring, etc.)
Capacity4people
A deep cold plunge bath kept at around 18 degrees, with a depth of 1m (110cm at the deepest point). It uses well water and features a spiral staircase-like design. You can immerse yourself up to your shoulders while standing, and the outstanding sense of openness allows you to cool your whole body at once.
Closed Days: Thursday
949-8505 Miyunaka, Tokamachi City, Niigata 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
Wrapped in the golden-colored waters by the Shinano River. Proud of its Finland sauna and cold plunge bath
Niigata Tokamachi City
"Mion Nakasato" is a one-room inn at Miyunaka Onsen, surrounded by the vast rural landscape and the Shinano River in Tokamachi City, Niigata Prefecture. Its greatest pride is its brown, silky-smooth, gentle spring water, known as the "golden-colored bath." The abundant benefits of its sodium chloride hydrogen carbonate spring warm you to the core and leave your skin smooth. What impresses sauna enthusiasts most is the Finland sauna and the deep cold plunge bath with a depth of 1m (110cm), using well water. The uniquely designed cold plunge bath, with its spiral staircase structure, lets you cool down your entire body at once with a strong sense of buoyancy. The bathhouse has high ceilings and an open feel, and the open-air bath lets you enjoy the changing seasons with all five senses.
TypeNatural Hot Spring
A sodium chloride hydrogen carbonate spring. Its distinctive brown, clear golden water has a gentle, mildly alkaline feel on the skin. Long loved as a "skin-beautifying bath," it leaves you feeling warm for a long time even after you get out.
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity20people
An authentic Finnish-style dry sauna. If you sit on the third tier, the distance to the ceiling is very short, allowing you to receive heat efficiently. With a spacious area that can accommodate more than 20 people, you can enjoy a long, relaxing sweat.
Water QualityNatural Water (Groundwater, Spring, etc.)
Capacity4people
A deep cold plunge bath kept at around 18 degrees, with a depth of 1m (110cm at the deepest point). It uses well water and features a spiral staircase-like design. You can immerse yourself up to your shoulders while standing, and the outstanding sense of openness allows you to cool your whole body at once.
Closed Days: Thursday
949-8505 Miyunaka, Tokamachi City, Niigata 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