Seaside sauna with exclusive views of the Bungo Channel, wrapped in Shioyu and the sound of waves
Ehime Matsuyama City
Seapa no Yu (Seapa MAKOTO) is a day-use onsen facility built on the coast of Hojo in Matsuyama, Ehime Prefecture. Its greatest attraction is the overwhelming location, with the Seto Inland Sea (Bungo Channel) spread out right in front of you. After warming your body in the highly saline Shioyu (a strong chloride spring) and then entering the sauna, the salt left on your skin dramatically promotes sweating. After cooling down in the spacious groundwater-fed cold plunge bath, head to the open-air seaside area with no wall between you and the sea. The outdoor relaxation wrapped in pleasant sea breezes and the sound of waves is a blissful experience unique to this place.
TypeNatural Hot Spring
Shioyu is a natural hot spring, a high-salinity strong chloride spring with a salt concentration so high it can sting the eyes. Bathing stimulates metabolism and warms the body from the core. The outdoor bath is completely open toward the sea, allowing you to soak while watching the sunset over the Seto Inland Sea, the changing sky, and fishermen out on the water.
Sauna TypeDry Sauna
Stove Typestone
A two-tier bench dry sauna equipped with a TV. Room temperature is about 85°C–96°C, so it gets properly hot. By pre-bathing in the signature Shioyu (a strong chloride spring) before entering the sauna, salt residues on the skin strongly promote sweating, producing an effect similar to a salt sauna. When the sunset pours through the windows, a nostalgic and beautiful scene unfolds.
Water QualityNatural Water (Groundwater, Spring, etc.)
A groundwater-fed cold plunge bath located immediately outside the sauna room. Water temperature is around 17°C–19°C. It is not ice-cold, but it is spacious enough for several people and is constantly refreshed with new water, so you can stay in comfortably for longer. After tightening your body in the cold plunge bath, the seaside open-air area with full-flat chairs awaits for the ultimate sea breeze outdoor relaxation.
Closed Days: None
1180 Hojo, Matsuyama, Ehime 799-2431, Japan
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
Seaside sauna with exclusive views of the Bungo Channel, wrapped in Shioyu and the sound of waves
Ehime Matsuyama City
Seapa no Yu (Seapa MAKOTO) is a day-use onsen facility built on the coast of Hojo in Matsuyama, Ehime Prefecture. Its greatest attraction is the overwhelming location, with the Seto Inland Sea (Bungo Channel) spread out right in front of you. After warming your body in the highly saline Shioyu (a strong chloride spring) and then entering the sauna, the salt left on your skin dramatically promotes sweating. After cooling down in the spacious groundwater-fed cold plunge bath, head to the open-air seaside area with no wall between you and the sea. The outdoor relaxation wrapped in pleasant sea breezes and the sound of waves is a blissful experience unique to this place.
TypeNatural Hot Spring
Shioyu is a natural hot spring, a high-salinity strong chloride spring with a salt concentration so high it can sting the eyes. Bathing stimulates metabolism and warms the body from the core. The outdoor bath is completely open toward the sea, allowing you to soak while watching the sunset over the Seto Inland Sea, the changing sky, and fishermen out on the water.
Sauna TypeDry Sauna
Stove Typestone
A two-tier bench dry sauna equipped with a TV. Room temperature is about 85°C–96°C, so it gets properly hot. By pre-bathing in the signature Shioyu (a strong chloride spring) before entering the sauna, salt residues on the skin strongly promote sweating, producing an effect similar to a salt sauna. When the sunset pours through the windows, a nostalgic and beautiful scene unfolds.
Water QualityNatural Water (Groundwater, Spring, etc.)
A groundwater-fed cold plunge bath located immediately outside the sauna room. Water temperature is around 17°C–19°C. It is not ice-cold, but it is spacious enough for several people and is constantly refreshed with new water, so you can stay in comfortably for longer. After tightening your body in the cold plunge bath, the seaside open-air area with full-flat chairs awaits for the ultimate sea breeze outdoor relaxation.
Closed Days: None
1180 Hojo, Matsuyama, Ehime 799-2431, Japan
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