Nationwide × Accommodation With Lukewarm OnsenRecommended Hotel·Ryokan

With a history of 700 years, this rare Onsen, known for its healing properties for eye ailments, is one of the hidden gems in the whole country. The "Eye Medicine Bath," featuring 100% natural flowing hot spring water, offers lukewarm temperatures perfect for long soaks. Enjoy this historic hidden Onsen, once used as a secret retreat by Uesugi Kenshin.

A single accommodation, "Hotel Iya Onsen," is located on the cliffs of the Iya Valley. An open-air bath is situated at the bottom of the valley, approximately 170 meters down via cable car, where you can soak while enjoying the stunning views of the gorge. The beauty of the valley can also be admired from the guest rooms.

Furuyu Onsen ONCRI, opened in April 2012, is an accommodation nestled at the foot of Mount Sefuri. Surrounded by lush nature with clear streams home to kajika frogs and fireflies, as well as seasonal wildflowers and chirping birds, this tranquil mountain village offers a serene escape. Furuyu Onsen ONCRI is a place where you can relax deeply and lose track of time.

“Kura-no-Yu,” a renovated Meiji-era storehouse bath, offers a lukewarm soak in our private 36°C natural hot spring, along with guest Rooms set within a traditional Japanese house of white plaster and black lacquer finishes. Each Room is equipped with a massage chair, and we welcome you with relaxed, unobtrusive hospitality. Furnishings, antiques, calligraphy, and paintings are displayed throughout the property, creating an atmosphere like an art museum. For dining, savor creative cuisine made with local and seasonal ingredients to your heart’s content.

With a history of around 2,000 years, Furu-yu Onsen is renowned for its “lukewarm bath,” a skin-beautifying spring at a gentle temperature of about 38°C. Enjoy the silky-smooth, soothing waters in free-flowing natural hot spring baths. Because the water is pleasantly mild, you can soak for longer and unwind at your own pace.Our signature Japanese kaiseki course features carefully selected local ingredients and house-made specialties, offering the most delicious seasonal flavors throughout the year. Savor our cuisine beautifully presented on Arita-yaki porcelain.

An accommodation featuring 100% natural hot spring water in its open-air baths and handmade cuisine emphasizing quality ingredients. Particularly, the hamo dishes from summer to early autumn are not to be missed. In 2023, a comfortable space utilizing natural materials was introduced, allowing guests to stay without worrying about dryness. Guests can soak in the highly alkaline water with skin-beautifying effects while enjoying the warmth of wood and dappled sunlight. The café space, equipped with Wi-Fi, offers coffee and sweets for enjoyment.

An adults-only hidden Accommodation, “Saga Fuga,” where tranquility and fine cuisine soothe the soul. Nestled in Furuyu Onsen with a 2,200-year history, its gently warm waters relax both body and mind with their uniquely soft feel.Our kaiseki cuisine, lavishly prepared with seasonal local ingredients from Saga, offers a blissful moment to savor the changing seasons with all five senses. In this nature-surrounded setting, you can also enjoy a sauna under the starry sky. We offer stays perfect for trips with someone special or for a restorative getaway just for you.

Luxurious time flows at this Onsen property with all separate rooms. From the open-air bath, you can enjoy a panoramic view of the Furu-yu Onsen townscape and the Kase River. Dinner includes Saga beef, a selection of 10 types of sashimi, 7 types of appetizers, and approximately 20 dishes in total. Enjoy at your Room.

A long-established Property located on the slopes of Mount Eboshi, one of the five peaks of Mount Aso, preserving the Jigoku Onsen which first opened in 1803. Stepping into the main building, which is over 100 years old and has been renovated after the Kumamoto Earthquake, feels like entering a different world, as if traveling back in time. The Onsen features three different sources, offering 11 baths across four locations, each with unique water qualities and atmospheres. Guests can enjoy the "Suzume no Yu," a "miraculous bath" rich in sulfur content with water bubbling up from the ground, as well as the highly acidic "Moto no Yu" and "Tamago no Yu," choosing baths based on their benefits and purposes. For dinner, a variety of courses are available, including seasonal hot pots, irori hearth dishes, and Kyoto-style kaiseki cuisine. Local wild boar and venison, caught by local hunters, offer a rustic and unique taste of Aso. Experience the blessings of magnificent nature through the Onsen and cuisine.

Nestled in the lush greenery of Minami Aso, "Chikurakutei" is a secluded accommodation where every room features a private open-air bath, illuminated by the enchanting glow of bamboo lights. The bamboo lights adorning the interiors and courtyard create a beautiful ambiance using "bamboo," as reflected in the name of this ryokan, offering guests relaxation and tranquility. The slightly warm alkaline simple hot spring water is gentle on the skin and highly praised for its beautifying effects. In addition to private open-air baths in all rooms, enjoy moments of peace and rejuvenation at our spacious public bath (indoor), surrounded by an atmosphere of openness.

The only Property at Kawahora Onsen, established under the orders of Takeda Shingen. Its two hot spring sources provide 1,250 liters per minute and are known as "Shingen's Hidden Onsen." All four baths feature natural free-flowing spring water and the Property is certified by the Association for Preserving Japan’s Onsen Heritage.

"Kajikaen," a natural hot spring accommodation in Okutsu Onsen, is renowned for its "Bijin no Yu" (beauty-enhancing onsen) with its own private source. All rooms offer stunning views of the Yoshii River, allowing guests to enjoy the beauty of nature throughout the seasons. The onsen features gentle lukewarm water, beauty-enhancing properties, and bubbly textures that rejuvenate both body and mind. From your room, you can hear the soothing sounds of the river and kajika frogs while enjoying the scents of fresh air and nature's blessings that stimulate all five senses. Indulge in a luxurious time surrounded by hot springs, breathtaking scenery, and abundant nature.

The accommodation is home to free-spirited cats, offering a soothing experience to visitors. The onsen features natural spring water with a gentle temperature, approximately 40°C indoors and 38°C outdoors, perfect for extended relaxation. All guest rooms overlook the clear stream of the Houki River and are designed with warm wooden interiors to create a cozy atmosphere. Meals are creative dishes made with seasonal local ingredients, including char and yamame trout freshly grilled just before serving. The accommodation also actively contributes to regional revitalization through initiatives such as opening a rescue cat café and promoting the "Oku-Nihon Silver Route." This is an ideal accommodation for those seeking harmony with nature and true relaxation.

58 minutes from Karuizawa Outlet. Kusatsu Now Resort Hotel, a spa resort hotel located in Kusatsu Onsen, offers day-use bathing, private open-air baths, as well as activities like tennis and golf.

Surrounded by the natural beauty of Setouchi, we offer you a tranquil and warm retreat. Our lobby lounge, filled with natural light, features a terrace with a foot bath. Rooms are intentionally designed without televisions to provide an escape from daily life and allow for true relaxation. Our pride is the Onsen, offering rare high-concentration radon hot springs directly sourced and flowing continuously. Experience alternating hot and cool baths to promote circulation, relieve fatigue, and refresh both body and mind. The mildly alkaline water is gentle on the skin with beautifying effects, enriched with minerals from ancient geological layers—enjoy this "ancient Onsen" at your leisure. The lounge includes a mini-library where you can explore carefully selected books or try glass pens paired with Sailor Ink made in Hiroshima/Kure at your convenience. At dusk, admire the twilight over Seto through large windows; by nightfall, relax by the soft flicker of our bioethanol fireplace.Throughout our facility, you'll find wallpaper crafted from local textile company paper cloth (Shifu) as well as works by Japanese washi artist Eriko Horiki—designs that harmonize beautifully with regional culture.At the "Hidamari Counter" next to the lobby, enjoy complimentary drinks or sample local spirits; in the evening, savor special late-night snacks prepared by our chef.

A secluded inn located in the valley of the Akaya River, a tributary of the Tone River. Known for its lukewarm therapeutic waters, it is renowned for alleviating neuralgia, joint pain, rheumatism, and whiplash. Ideal not only for therapeutic purposes but also for relaxing and rejuvenating amidst abundant nature. Enjoy the hidden hot springs to the fullest.

A Property where you can enjoy the natural hot spring water from the source of Umegashima Onsen, which boasts a history of over 1,700 years, with a pH of 9.6, flowing directly without any recycling. Umegashima Onsen, known as one of the secret Onsens favored by the famous Takeda Shingen, offers its pure source water without any heating for your ultimate relaxation. Our specialty, the Umegashima-bred Suruga game fowl hot pot, is made with a broth simmered for about half a day using chicken bones, creating an exquisite flavor. Additionally, indulge in unique dishes that combine the mountain delicacies of Umegashima, surrounded by nature, with fresh seafood from Shizuoka.