Top 10 Must-Visit Public Hot Springs in Japan

Here are some of the best hot springs in Japan, from Hakone to Yakushima Island.

Wellness-centered retreats have become a prominent trend in contemporary society; however, the ancient Japanese bathing traditions offer a lifestyle that extends back thousands of years. The island nation in East Asia is endowed with an abundance of geothermal hot springs that are believed to provide therapeutic advantages—such as enhancing circulation, alleviating muscle discomfort, and fostering relaxation.

Over the centuries, a fully developed bathing culture has emerged around onsens—a general term for the naturally heated, mineral-laden waters and the accompanying bathhouse facilities—implying that certain protocols, customs, and etiquette should be adhered to by both residents and visitors.

If you intend to engage in this time-honored practice, it is essential to honor the profound history and cultural significance. Immersion in public hot springs is principally a communal experience. Most onsens maintain separate facilities for males and females, and many do not permit individuals with tattoos. Should you have body art, it is advisable to investigate specific regulations beforehand to avoid the possibility of being denied entry. “Prior to entering an onsen, it is customary to cleanse oneself,” remarks Keiko Watanabe, the spa and wellness manager across the Hoshino Resorts portfolio. “After exiting, be sure to hydrate thoroughly and apply moisturizer.”

Continue reading to discover the premier public hot springs in Japan, as recommended by local experts.

1. Togura Kanze Onsen – Chikuma, Nagano Prefecture

“A favored stop for travelers en route to Zenkoji Temple in the vicinity of Nagano, Togura Kanze Onsen features vibrant emerald green hot springs,” states Watanabe. The temperature is moderate, allowing for an extended soak to fully appreciate the relaxing benefits. “Sulfur also enhances skin elasticity, so upon bathing, you will emerge feeling rejuvenated and moisturized,” she adds.

2. Tenzan – Hakone, Kanagawa Prefecture

As one of the most renowned hot springs towns in Japan, Hakone offers numerous tranquil locations for immersion. Nature enthusiasts will cultivate a profound bond with the Earth and experience a genuine sense of tranquility after a brief visit to Tenzan, a series of naturally warmed outdoor rock pools enveloped in lush greenery. Additionally, a bathhouse is positioned within a traditional structure.

3. Hirauchi Kaichu Onsen – Yakushima Island, Kagoshima Prefecture

Situated at the southern tip of Yakushima Island and accessible solely during low tide, Hirauchi Kaichu Onsen is an open-air, sulfur-based hot spring located along a rugged coastline, with water emerging from below sea level. “The exceptional coastal atmosphere renders it a notably distinctive and special location for soaking,” notes Simon Metcalfe, a manager at the Kyushu Tourism Promotion Organization.

4. Yu-no-sato – Unzen, Nagasaki Prefecture

Yu-no-sato is a quaint public onsen in Unzen, acknowledged as the oldest communal bath in the vicinity. Aside from its historical significance, patrons visit for the curative properties associated with the hot, acidic, iron-rich waters. Watanabe cautions that the temperature can be quite intense; thus, it is prudent to practice kakeyu (utilizing buckets filled with water outside the tub) prior to fully immersing oneself and soaking for no longer than five minutes initially.

5. Shitan-yu – Shichirida Onsen, Oita Prefecture

A newly renovated section of Konoha-no-yu, known as Shitan-yu, is reputed to be the most concentrated carbonated spring throughout Japan. The cooler temperature and effervescence invigorate the body (gradually raising your temperature), allowing for a prolonged and enjoyable bathing experience.

6. Onto – Nagato Yumoto Onsen, Yamaguchi Prefecture

As a quintessential illustration of how rich hot springs traditions blend with contemporary design, Onto serves as a stunning day-use facility that was recently reestablished in historic Nagato Yumoto Onsen. “The lukewarm water is alkaline and promotes skin rejuvenation while naturally eliminating impurities,” explains Watanabe.

7. Matusiro-sou – Matsushiro, Nagano Prefecture

Formerly a hidden therapeutic location for the forces of the influential daimyo Shingen Takeda, Matusiro-sou, located in the historic castle town of Sanada Jumangoku, has transformed into one of the most renowned spa retreats in Japan. Increased iron concentrations impart a golden hue to the source-fed hot spring, alongside myriad beneficial traits, ranging from combatting fatigue to enhancing skin health.

8. Monju-no-yu – Kakeyu Onsen, Nagano Prefecture

The practice of bathing at Monju-no-yu dates back 1,200 years. The hot water is particularly beneficial for the feet and lower back. “It is quite revitalizing to soak for around five minutes,” asserts Watanabe. “Just be cautious not to overstay your welcome to prevent overheating.” The locale is also home to numerous sacred sites, making it a delightful area for a stroll following your visit to the hot spring.

9. Sahako-no-yu – Iwaki, Fukushima Prefecture

Located within a hot spring town boasting over a millennium of history, Sahako-no-yu is a historic public bathhouse that dates back to the Edo period. “The elevated water temperature and sulfur content offer numerous health benefits, and there are well-known cherry blossom spots to appreciate,” Watanabe elaborates. She recommends practicing kakeyu before entry, then initially submerging your feet and gradually acclimating your body to the water.

10. Naminoyu ‘Akane’ – Unzen, Nagasaki Prefecture

Many individuals consider Naminoyu ‘Akane’ the premier outdoor hot springs venue in Obama Onsen, a resort town situated on the eastern side of the Shimabara Peninsula. In addition to the possibilities for relaxation in some of the hottest spring waters, visitors are treated to vistas of the Tachibana Gulf and enchanting sunsets.