Kagawa Kanonji City
A leading sauna theme park in the Seto Inland Sea area, featuring 11 saunas and 7 cold plunge baths
"Kotohiki Kairo" is a large hot spring facility facing Ariake Beach in Kanonji City, Kagawa Prefecture. Following its 2024 renewal, it has evolved into a sauna theme park equipped with 11 types of saunas and 7 types of cold plunge baths, among the largest in Japan. With experiences found nowhere else, including an ocean-view sauna overlooking the Seto Inland Sea, a kama sauna that recreates a traditional Japanese steam bath, and unique cold plunge baths made from repurposed local soy sauce barrels and sake barrels, it is packed with highlights. The east and west bathing areas alternate between men and women by day, so you can enjoy a different sauna experience each time you visit.
A therapeutic spring classified as a calcium-sodium chloride spring. It offers excellent warming and moisturizing effects, leaving the skin soft and hydrated, which is why it is also called the finishing bath for beautiful skin. With a wide variety of baths such as seawater baths, bubble baths, and medicinal baths, you can enjoy high-quality hot spring water while feeling the nature of the Seto Inland Sea.
A sauna wrapped in the refreshing aroma of Setouchi lemons. Its Scandinavian spa-style design features a white base accented with blue and yellow. Self-löyly is available, and it is an open space where conversation is welcome. Enjoy a relaxing moment that soothes all five senses in gentle heat. (Men: odd-numbered days / Women: even-numbered days)
Open Year-Round
Kagawa Kanonji City
A leading sauna theme park in the Seto Inland Sea area, featuring 11 saunas and 7 cold plunge baths
"Kotohiki Kairo" is a large hot spring facility facing Ariake Beach in Kanonji City, Kagawa Prefecture. Following its 2024 renewal, it has evolved into a sauna theme park equipped with 11 types of saunas and 7 types of cold plunge baths, among the largest in Japan. With experiences found nowhere else, including an ocean-view sauna overlooking the Seto Inland Sea, a kama sauna that recreates a traditional Japanese steam bath, and unique cold plunge baths made from repurposed local soy sauce barrels and sake barrels, it is packed with highlights. The east and west bathing areas alternate between men and women by day, so you can enjoy a different sauna experience each time you visit.
A therapeutic spring classified as a calcium-sodium chloride spring. It offers excellent warming and moisturizing effects, leaving the skin soft and hydrated, which is why it is also called the finishing bath for beautiful skin. With a wide variety of baths such as seawater baths, bubble baths, and medicinal baths, you can enjoy high-quality hot spring water while feeling the nature of the Seto Inland Sea.
A sauna wrapped in the refreshing aroma of Setouchi lemons. Its Scandinavian spa-style design features a white base accented with blue and yellow. Self-löyly is available, and it is an open space where conversation is welcome. Enjoy a relaxing moment that soothes all five senses in gentle heat. (Men: odd-numbered days / Women: even-numbered days)
Open Year-Round
A modern take on the traditional Japanese steam bath known as a kama-buro, which has been passed down for more than 1,200 years. The huge kamakura-shaped interior is gently enveloped by soft radiant heat. Waterproof tatami mats are laid on the floor, allowing you to enjoy a Japanese-style sauna bath while lying down. (Men: odd-numbered days / Women: even-numbered days)
A sauna inspired by a floating sauna in Oslo, Norway, that lets you feel like setting sail. The breathtaking view overlooks Ariake Beach and the Seto Inland Sea, and you can enjoy powerful heat from self-löyly. In a silent space where conversation is not allowed, the experience of being intensely heated while gazing at the horizon is exceptional. (Men: odd-numbered days / Women: even-numbered days)
A unique sauna car set in the open-air area, built by modifying a real manual-transmission car. Its appeal lies in the compact, enclosed feel of the interior and the excellent circulation of steam created by self-löyly. In a playful space full of surprises, you can enjoy a special sauna time unlike anywhere else. (Men: odd-numbered days / Women: even-numbered days)
A large dome tent sauna that makes the most of the spacious open-air area. Equipped with a powerful stove, it lets you experience the efficient convection of steam that is unique to a dome shape. With a lively atmosphere where conversation is allowed, it is a symbolic room of the sauna theme park that can be enjoyed by groups. (Men: odd-numbered days / Women: even-numbered days)
The highly insulated tent sauna MORZH is placed in a prime location with a panoramic view of the Seto Inland Sea. You can luxuriate in the powerful heat from its high-output stove and the steam created by self-löyly, all while enjoying a stunning view. (Men: odd-numbered days / Women: even-numbered days)
A sauna whose name means "fire" in Finnish. In the dimly lit room with subdued lighting, you can sink into meditation while watching the flickering flames, or candles at night. Self-löyly is available, and in the silence that sharpens the senses, it is a space where you can deeply face yourself. (Men: even-numbered days / Women: odd-numbered days)
A sauna characterized by white walls inspired by the white sand of Ariake Beach. The view of the Seto Inland Sea framed by the window gives you the feeling of relaxing on a beach. Positioned to face west, it offers a spectacular sunset selected as one of Japan's Top 100 Sunsets, which you can fully enjoy from inside the room at dusk. (Men: even-numbered days / Women: odd-numbered days)
An ocean-view sauna inspired by SALT, a sauna facility in Norway. With the best possible location directly facing Ibuki Island floating in the Seto Inland Sea, you can relax in the steam while gazing at the beauty of the many islands. This room blends the pleasant heat of self-löyly with the scenery unique to the Seto Inland Sea. (Men: even-numbered days / Women: odd-numbered days)
The MAX model of a highly insulated tent sauna, with a spacious interior. Its powerful stove raises the room temperature firmly, enveloping your whole body in thick, intense heat. Enjoy the surprising spaciousness and heat that overturn the conventional idea of a tent sauna, all while feeling the sea breeze of the Seto Inland Sea. (Men: even-numbered days / Women: odd-numbered days)
A sauna with a rugged hexagonal exterior, its name meaning "sacred place" in ancient Finnish. The compact interior circulates heat well, and self-löyly lets you adjust the humidity to your liking. In a mysterious atmosphere reminiscent of deep in the forest, you can quietly face the sauna. (Men: even-numbered days / Women: odd-numbered days)
A cold plunge bath made with chilled natural hot spring water. Its brown cloudiness is proof of rich hot spring minerals, and its soft texture on the skin is one of its defining features. This is a luxurious cold plunge bath unique to the facility, where you can enjoy the blessings of hot spring water in alternating hot and cold bathing.
A cold plunge bath that recreates Nordic-style cold bathing using seawater drawn from the Seto Inland Sea. The crisp chill unique to seawater sharpens and tightens the body after sauna use. You can enjoy an authentic Nordic-style sea-bathing experience while feeling the sea breeze.
Repurposed from an extra-large soy sauce barrel that was actually used on Shodoshima. Standing 170 cm tall, its biggest feature is that you can bathe while standing. It uses chilled natural spring water in a free-flowing style, allowing you to fully relax your whole body inside the enormous, enveloping barrel. (Men: odd-numbered days / Women: even-numbered days)
A renovated sake barrel that was once used in the production of Mitoyo Tsuru, a local brand of sake. Inside the barrel, with its scent of wood and sense of history, you can enjoy the unique feeling of soaking in chilled sake. A atmospheric cold plunge bath that makes the most of local resources. (Men: odd-numbered days / Women: even-numbered days)
An ultra-low-temperature single cold plunge bath, with the chiller set to 3°C at maximum output. You can experience an intense chill like jumping into a frozen Nordic lake, followed by an overwhelming sense of euphoria. The ultimate cool-down spot, dedicated to the most stoic sauna enthusiasts. (Men: odd-numbered days / Women: even-numbered days)
A reclining-style cold plunge bath using chilled natural spring water in a free-flowing style. While looking up at the sky, you can cool down slowly with a sense of floating. It places little strain on the body and leads you into tottonou in a relaxed state. (Men: even-numbered days / Women: odd-numbered days)
A single-person pottery cold plunge bath made from Shigaraki ware. In your own personal space, you can focus on cooling down without worrying about anyone around you. Despite its compact size, it delivers a firm cold sensation, making it ideal for resetting between sauna visits. (Men: even-numbered days / Women: odd-numbered days)
A modern take on the traditional Japanese steam bath known as a kama-buro, which has been passed down for more than 1,200 years. The huge kamakura-shaped interior is gently enveloped by soft radiant heat. Waterproof tatami mats are laid on the floor, allowing you to enjoy a Japanese-style sauna bath while lying down. (Men: odd-numbered days / Women: even-numbered days)
A sauna inspired by a floating sauna in Oslo, Norway, that lets you feel like setting sail. The breathtaking view overlooks Ariake Beach and the Seto Inland Sea, and you can enjoy powerful heat from self-löyly. In a silent space where conversation is not allowed, the experience of being intensely heated while gazing at the horizon is exceptional. (Men: odd-numbered days / Women: even-numbered days)
A unique sauna car set in the open-air area, built by modifying a real manual-transmission car. Its appeal lies in the compact, enclosed feel of the interior and the excellent circulation of steam created by self-löyly. In a playful space full of surprises, you can enjoy a special sauna time unlike anywhere else. (Men: odd-numbered days / Women: even-numbered days)
A large dome tent sauna that makes the most of the spacious open-air area. Equipped with a powerful stove, it lets you experience the efficient convection of steam that is unique to a dome shape. With a lively atmosphere where conversation is allowed, it is a symbolic room of the sauna theme park that can be enjoyed by groups. (Men: odd-numbered days / Women: even-numbered days)
The highly insulated tent sauna MORZH is placed in a prime location with a panoramic view of the Seto Inland Sea. You can luxuriate in the powerful heat from its high-output stove and the steam created by self-löyly, all while enjoying a stunning view. (Men: odd-numbered days / Women: even-numbered days)
A sauna whose name means "fire" in Finnish. In the dimly lit room with subdued lighting, you can sink into meditation while watching the flickering flames, or candles at night. Self-löyly is available, and in the silence that sharpens the senses, it is a space where you can deeply face yourself. (Men: even-numbered days / Women: odd-numbered days)
A sauna characterized by white walls inspired by the white sand of Ariake Beach. The view of the Seto Inland Sea framed by the window gives you the feeling of relaxing on a beach. Positioned to face west, it offers a spectacular sunset selected as one of Japan's Top 100 Sunsets, which you can fully enjoy from inside the room at dusk. (Men: even-numbered days / Women: odd-numbered days)
An ocean-view sauna inspired by SALT, a sauna facility in Norway. With the best possible location directly facing Ibuki Island floating in the Seto Inland Sea, you can relax in the steam while gazing at the beauty of the many islands. This room blends the pleasant heat of self-löyly with the scenery unique to the Seto Inland Sea. (Men: even-numbered days / Women: odd-numbered days)
The MAX model of a highly insulated tent sauna, with a spacious interior. Its powerful stove raises the room temperature firmly, enveloping your whole body in thick, intense heat. Enjoy the surprising spaciousness and heat that overturn the conventional idea of a tent sauna, all while feeling the sea breeze of the Seto Inland Sea. (Men: even-numbered days / Women: odd-numbered days)
A sauna with a rugged hexagonal exterior, its name meaning "sacred place" in ancient Finnish. The compact interior circulates heat well, and self-löyly lets you adjust the humidity to your liking. In a mysterious atmosphere reminiscent of deep in the forest, you can quietly face the sauna. (Men: even-numbered days / Women: odd-numbered days)
A cold plunge bath made with chilled natural hot spring water. Its brown cloudiness is proof of rich hot spring minerals, and its soft texture on the skin is one of its defining features. This is a luxurious cold plunge bath unique to the facility, where you can enjoy the blessings of hot spring water in alternating hot and cold bathing.
A cold plunge bath that recreates Nordic-style cold bathing using seawater drawn from the Seto Inland Sea. The crisp chill unique to seawater sharpens and tightens the body after sauna use. You can enjoy an authentic Nordic-style sea-bathing experience while feeling the sea breeze.
Repurposed from an extra-large soy sauce barrel that was actually used on Shodoshima. Standing 170 cm tall, its biggest feature is that you can bathe while standing. It uses chilled natural spring water in a free-flowing style, allowing you to fully relax your whole body inside the enormous, enveloping barrel. (Men: odd-numbered days / Women: even-numbered days)
A renovated sake barrel that was once used in the production of Mitoyo Tsuru, a local brand of sake. Inside the barrel, with its scent of wood and sense of history, you can enjoy the unique feeling of soaking in chilled sake. A atmospheric cold plunge bath that makes the most of local resources. (Men: odd-numbered days / Women: even-numbered days)
An ultra-low-temperature single cold plunge bath, with the chiller set to 3°C at maximum output. You can experience an intense chill like jumping into a frozen Nordic lake, followed by an overwhelming sense of euphoria. The ultimate cool-down spot, dedicated to the most stoic sauna enthusiasts. (Men: odd-numbered days / Women: even-numbered days)
A reclining-style cold plunge bath using chilled natural spring water in a free-flowing style. While looking up at the sky, you can cool down slowly with a sense of floating. It places little strain on the body and leads you into tottonou in a relaxed state. (Men: even-numbered days / Women: odd-numbered days)
A single-person pottery cold plunge bath made from Shigaraki ware. In your own personal space, you can focus on cooling down without worrying about anyone around you. Despite its compact size, it delivers a firm cold sensation, making it ideal for resetting between sauna visits. (Men: even-numbered days / Women: odd-numbered days)
