A Rare Spring That Emerges Directly from the Bath
The most remarkable feature of Chihara Onsen is its underfloor spring, where the hot spring water rises directly through the bottom of the bathing pool.
As you enter the bath, small bubbles of carbon dioxide can be seen rising from beneath your feet. The bubbles gently surround the body, creating a bathing experience that allows visitors to feel the natural energy of the spring itself.
Such springs are extremely rare in Japan. Rather than water being pumped into a conventional bathtub, the bath is supplied directly by the source beneath it.
The water has a distinctive yellowish-brown color and is relatively cool, making it suitable for soaking slowly over an extended period. The gentle temperature allows bathers to relax while gradually warming their bodies.
A Mineral-Rich High-Concentration Spring
Chihara Onsen is classified as a high-concentration hot spring, with approximately 10 to 11 grams of dissolved mineral components per kilogram of spring water.
Because of its rich mineral content, the spring has traditionally been valued for bathing associated with various ailments, including cuts, burns, and chronic skin conditions.
A Sodium-Rich Spring with Carbon Dioxide
The spring is classified as a sodium-chloride and sodium-bicarbonate spring. Its mineral-rich water is traditionally appreciated for its warming and heat-retaining qualities.
The carbon dioxide contained in the spring water is also associated with the expansion of peripheral blood vessels. The spring has traditionally been regarded as beneficial for poor circulation and sensitivity to cold.
Chihara Onsen is also rich in metasilicic acid, a component often associated with soft, healthy-looking skin. For this reason, the spring is also known as a “beauty hot spring.”
The Atmosphere of a Traditional Toji Retreat
Chihara Onsen has been used as a therapeutic bathing retreat since it opened in the early Meiji period. In the past, its role as a place for recuperation was so important that bathing purely for sightseeing was reportedly restricted.
Today, the facility is available for day bathing only, but much of its traditional atmosphere remains intact. The bathing area is simple and old-fashioned, with a central partition separating the men’s and women’s sides.
Unlike modern resort-style hot spring facilities, Chihara Onsen offers a more authentic experience centered on the spring itself. The lack of unnecessary amenities allows visitors to focus on the water, the surrounding nature, and the quiet rhythm of traditional Japanese bathing culture.
The Goemonburo and Seasonal Bathing
The source temperature is approximately 34°C, which is relatively cool for a Japanese hot spring. During colder weather, bathers may therefore find it difficult to stay warm after leaving the main spring.
From around October through June, a traditional Goemonburo is provided. This old-fashioned cast-iron-style bath is heated with firewood and allows visitors to warm themselves thoroughly after enjoying the cooler natural spring.
The combination of a naturally cool spring and a wood-heated bath is another distinctive feature of Chihara Onsen and reflects its traditional bathing culture.
A Second Spring Hidden Inside the Rock
Deeper inside the bathing area is another remarkable spring. The source emerges from a rock formation inside a small cave.
Visitors can look inside through a pair of traditional double doors and observe the spring water bubbling up together with carbon dioxide, with mineral deposits floating on the surface. The sight offers a fascinating glimpse into the natural processes behind the hot spring.
The Tradition of Taking the Spring Water Home
Because the spring water contains such a high concentration of minerals, local people have traditionally collected it in large bottles and taken it home.
Even today, visitors can take the water home in designated containers. Some people use it on their skin in a way similar to a natural lotion, making it an interesting part of the local hot spring culture.
Recognized as One of Japan’s Remarkable Hidden Hot Springs
In 2021, Chihara Onsen was selected as the No. 1 hot spring in the “Japan Hyaku Hinasen”, a selection highlighting distinctive and lesser-known hot springs across Japan.
Its recognition is closely connected with the extraordinary experience of bathing directly above the natural source and the distinctive quality of its mineral-rich water.
Visitors often describe the experience as unlike that of an ordinary hot spring, particularly because they can feel the spring bubbling directly beneath them. For travelers interested in traditional Japanese bathing culture, Chihara Onsen provides a particularly memorable experience.
Things to Know Before Visiting
Chihara Onsen is located in a remote mountain area, so visitors should allow plenty of time for the journey. After leaving the main roads, the route includes narrow mountain roads where passing oncoming vehicles can be difficult.
If you are driving, proceed carefully and avoid rushing. The secluded location is part of the appeal of Chihara Onsen, but it also means that visitors should plan their journey with the road conditions in mind.
It is also important to respect the atmosphere of the facility as a traditional toji bathing retreat. Follow the bathing rules, keep the surroundings quiet, and be considerate of other guests. Although the spring is suited to slow, extended bathing, visitors should also avoid occupying the bath unnecessarily when others are waiting.
A Deeply Relaxing Experience in Nature
Chihara Onsen is very different from a modern hot spring resort. There are no elaborate attractions or luxurious facilities. Instead, its appeal lies in the opportunity to quietly experience a natural spring in the mountains.
Soaking in water that rises directly from beneath your feet, surrounded by the peaceful landscape of Misato Town, offers a rare opportunity to slow down and reconnect with nature.
For international travelers looking for an authentic Japanese onsen and toji experience, Chihara Onsen offers a glimpse into a traditional bathing culture that has been preserved for generations.
When visiting Misato Town and the Sanbe area, consider making the journey to this secluded hot spring. Take your time, respect the traditional atmosphere, and enjoy the unique experience of bathing in water that emerges naturally from deep beneath the earth.