Ninomaru Onsen is a peaceful hot spring facility surrounded by the beautiful mountains and forests of Yuasa Town, Wakayama Prefecture. Located beside a gently flowing river, the facility allows visitors to enjoy the sounds of nature and the changing scenery of the seasons while relaxing in the hot springs.
Yuasa is famous for its traditional soy sauce production, but the town also offers beautiful natural landscapes and opportunities for relaxation. Ninomaru Onsen brings these attractions together in one destination, with hot springs, saunas, dining, and accommodation available in a tranquil mountain setting.
One of the highlights of Ninomaru Onsen is its open-air bath beside the Yamada River. As you soak in the warm water, you can listen to the gentle sound of the river and enjoy the fresh scent of the surrounding forest.
The experience is particularly enjoyable because the scenery changes throughout the year. Fresh greenery in spring, lush forests in summer, colorful leaves in autumn, and the quiet atmosphere of winter each create a different bathing experience.
The indoor bath is finished with Japanese cypress wood, creating a warm and relaxing atmosphere. The natural fragrance of the wood adds another sensory element to the experience and makes the bathing area feel especially peaceful.
The spring water at Ninomaru Onsen is classified as an alkaline simple hot spring, with a pH of approximately 10. The water is known for its smooth, slightly silky texture and is gentle on the skin.
Because the water can leave the skin feeling soft and smooth after bathing, it is popularly described as a “beauty hot spring”. For travelers looking to relax after sightseeing, soaking in the mineral-rich natural spring water provides a refreshing way to unwind.
Ninomaru Onsen has also attracted attention as a destination for authentic Finnish-style sauna experiences. Recent renovations have created an environment where visitors can enjoy the traditional cycle of sauna bathing, cooling down in water, and relaxing outdoors in nature.
The experience begins with a comfortably heated sauna, followed by a refreshing bath using cooled natural spring water. Afterward, visitors can relax outdoors surrounded by the forest and listen to the sounds of nature. This relaxing cycle is similar to the Japanese sauna concept of “totonou,” a state of deep physical and mental relaxation.
For an even more exclusive experience, Ninomaru Onsen offers private sauna cabins by reservation. These provide a more secluded environment where visitors can enjoy the sauna at their own pace.
One unique option is the “Taki no Sauna,” or Waterfall Sauna, which offers an unusual opportunity to cool down in a natural setting near a waterfall. Another is the “Mori no Sauna,” or Forest Sauna, where guests can enjoy a private sauna surrounded by trees.
These special sauna experiences combine traditional sauna culture with the natural environment of Wakayama, creating an experience that is difficult to find in an urban setting.
Ninomaru Onsen is more than a day-trip bathing facility. Visitors can also stay in log cabin-style cottages and traditional lodging facilities located around the hot spring area.
The accommodations are designed to blend comfortably with the surrounding natural environment. Depending on the room, facilities include kitchens, beds, and Japanese-style tatami rooms, allowing guests to enjoy a comfortable stay while surrounded by the peaceful atmosphere of the mountains.
Staying overnight allows visitors to experience a slower pace of life. In the morning, you may wake to the sound of birds singing in the surrounding forest. In the evening, you can enjoy beautiful views of the sunset over Yuasa Bay.
This combination of hot springs, forest, mountains, and ocean views creates a relaxing experience that is difficult to replicate in a busy city. An overnight stay is especially appealing for travelers who want to experience the quieter side of rural Japan.
Food is another important part of the Ninomaru Onsen experience. The facility’s restaurant offers a variety of dishes featuring local ingredients and flavors from Wakayama.
One of the popular choices is ramen made with Yuasa soy sauce. The rich, savory flavor of the locally produced soy sauce gives the dish a distinctive regional character.
The restaurant also offers ramen created by popular restaurants from the Kansai region, as well as spicy curry, shirasu-don topped with young sardines, and other dishes.
Enjoying a warm meal after relaxing in the hot springs or sauna is one of the simple pleasures of visiting Ninomaru Onsen. For travelers, local food also provides an opportunity to discover the culinary culture of Yuasa beyond its famous soy sauce.
Despite its peaceful mountain location, Ninomaru Onsen is relatively easy to reach. It is approximately seven minutes by car from Yuasa Interchange and around 12 minutes by taxi from JR Yuasa Station.
This convenient access makes it possible to combine a visit to the hot springs with sightseeing in Yuasa. Visitors can explore the town’s historic streets and traditional soy sauce culture before heading into the mountains for a relaxing soak.
Ninomaru Onsen combines hot springs, saunas, dining, and accommodation in one relaxing destination. Its greatest attraction is the opportunity to enjoy these experiences while surrounded by the sounds and scenery of nature.
For international visitors, the facility offers a chance to experience several aspects of Japanese wellness culture in one place. You can soak in a natural hot spring, enjoy a Finnish-style sauna, cool down with spring water, relax beneath the open sky, and savor a meal featuring local ingredients.
A visit to Ninomaru Onsen is an opportunity to step away from the pace of everyday life and enjoy the peaceful side of rural Japan. The sound of the river, the fragrance of the forest, the warmth of the hot spring, and the changing seasonal scenery create a deeply relaxing atmosphere.
Combined with Yuasa’s historic townscape, traditional soy sauce culture, and local cuisine, Ninomaru Onsen makes an excellent stop for travelers exploring Wakayama.
Whether you visit for a few hours or stay overnight, take your time, enjoy the natural surroundings, and discover the relaxing atmosphere of this mountain hot spring retreat.