Ushio Onsen is a historic hot spring resort in Unnan City, Shimane Prefecture, surrounded by the beautiful nature and rich cultural heritage of the Izumo region. With a history stretching back approximately 1,300 years, the hot spring has been enjoyed by generations of visitors from ancient times to the present day.
Known as the “inner retreat of Matsue”, Ushio Onsen lies quietly among the mountains. Away from the bustle of major tourist destinations, it offers travelers a peaceful place to relax, soak in natural hot spring waters, and enjoy the tranquil atmosphere of rural Japan.
Ushio Onsen is one of the historic hot springs mentioned in the Izumo Fudoki, an ancient Japanese record compiled in the Nara period. The text describes a hot spring in the river at Yubuchi Village along a small river associated with Suga.
This reference shows that hot spring water was already emerging in the area more than 1,300 years ago. Ushio Onsen can therefore be regarded as a precious bathing destination that has been closely connected with the lives of local people since ancient times.
During the Edo period, Matsudaira Fumai, the lord of the Matsue Domain and a renowned tea master, is also recorded as having visited the area. The pleasant qualities of the hot spring were appreciated at that time, and the quiet surroundings continue to preserve the atmosphere of its long history.
Ushio Onsen is located in a mountain valley along the upper reaches of the Aka River, a tributary of the Hii River. Dense forests surround the hot spring area, creating beautiful scenery throughout the year.
In spring, fresh green leaves cover the mountains. Summer brings the refreshing sound of clear streams, while autumn transforms the forest into a colorful display of foliage. In winter, snow creates a serene landscape that gives the hot spring town a completely different character.
Early summer is a particularly magical time to visit. Genji fireflies can be seen dancing around the Aka River, and Ushio Onsen is sometimes described as a “hot spring of fireflies.”
As the surrounding area becomes dark, the soft lights of the fireflies appear among the trees and along the river. Watching these tiny lights move through the night creates an unforgettable experience and is one of the seasonal highlights of Ushio Onsen.
The main spring at Ushio Onsen is a simple hot spring, known for its gentle feel and relatively low irritation to the skin. The water is mildly alkaline, with a pH of approximately 8.3.
The mildly alkaline water is often appreciated for its smooth feel on the skin. After bathing, visitors can enjoy a pleasant sensation of softness and moisture, which has contributed to the spring’s reputation as a “beauty hot spring.”
A newer spring source also contains sodium, sulfate, and chloride components. The mineral composition is valued for helping the body stay warm after bathing. The source temperature is approximately 45°C, making it suitable for a relaxing soak.
Ushio Onsen has long been used as a place for toji, the traditional Japanese practice of spending an extended period bathing in hot springs for rest and recuperation.
The spring has traditionally been associated with relief from conditions such as nerve pain, joint pain, muscle pain, and chronic skin conditions. It has also been valued as a place to relax and recover from everyday fatigue and stress.
After a bath, visitors can enjoy not only the refreshing sensation of the warm water but also the deep sense of relaxation that comes from spending time in a quiet mountain environment.
The hot spring town of Ushio Onsen is not large, and that is part of its appeal. Instead of the busy atmosphere found at major resort destinations, visitors will find a peaceful and intimate setting where they can slow down and enjoy the surrounding nature.
The area’s inns offer open-air baths with different atmospheres, allowing guests to experience bathing while surrounded by forests and the changing scenery of the seasons.
Keiso is a public bathhouse where visitors can enjoy hot spring water directly from the source. It is also a place where travelers can encounter local residents and experience a more traditional side of Japanese bathing culture.
The facility also includes a sauna and relaxation areas, making it a convenient place to spend a leisurely period after sightseeing in the surrounding area.
Ushioso is one of the best-known traditional inns in the Ushio Onsen area. Surrounded by trees and natural scenery, the inn provides a peaceful atmosphere that blends naturally with the surrounding landscape.
One of its highlights is the impressive open-air bath known as “Takaraju-no-Yu.” Large natural stones are incorporated into the bath, while the clear hot spring water and surrounding forest create a beautiful setting.
The open-air bath is surrounded by large chinquapin trees said to be approximately 800 years old. Bathing among these ancient trees can create the feeling of being immersed in the forest itself.
Soaking in the warm water while listening to the quiet sounds of nature is a luxurious way to forget the noise and stress of everyday life.
Staying at an inn in Ushio Onsen is also an opportunity to enjoy cuisine made with fresh ingredients from the San’in region.
Local specialties include nodoguro, or blackthroat seaperch, shijimi clams, Okuizumo Wagyu beef, and rice grown in traditional terraced paddies. These ingredients showcase the rich food culture of Shimane, where mountains, rivers, and the nearby Sea of Japan provide a wide variety of high-quality foods.
Meals served around a traditional irori hearth are especially atmospheric. Seasonal ingredients and changing menus also mean that each visit can offer a different taste of the region.
Ushio Onsen can be reached relatively easily from Izumo-Daito Station on the JR Kisuki Line. The journey takes approximately 7 minutes by bus or around 10 minutes by taxi.
The hot spring area can also be reached by car from Matsue and Izumo, making it convenient to combine a stay at Ushio Onsen with sightseeing elsewhere in eastern Shimane.
Ushio Onsen is an attractive place to stay while exploring the many shrines and historic sites of Unnan and the wider Izumo region. Travelers can combine a relaxing hot spring stay with a visit to Izumo Taisha Grand Shrine and other important cultural sites.
The area is also close to the Hii River basin, a region strongly associated with the famous Japanese myth of Yamata-no-Orochi, the eight-headed serpent defeated by the deity Susanoo-no-Mikoto.
For travelers interested in Japanese mythology, ancient history, and traditional culture, staying at Ushio Onsen offers an excellent opportunity to explore these stories while enjoying the peaceful atmosphere of the countryside.
Ushio Onsen is a special destination where approximately 1,300 years of hot spring history meets the beautiful natural landscape of Unnan.
Rather than offering the excitement of a large tourist resort, Ushio Onsen invites visitors to slow down and enjoy a quieter side of Japan. The gentle hot spring water, traditional inns, ancient trees, seasonal scenery, local cuisine, and softly glowing fireflies in early summer all contribute to its unique atmosphere.
For travelers wishing to escape the pace of everyday life, there are few things more relaxing than soaking in a historic hot spring while surrounded by the forests and mountains of the Izumo region.
A visit to Ushio Onsen is not simply a bathing experience. It is an opportunity to connect with the ancient history, mythology, nature, and traditional culture of Shimane while enjoying a peaceful retreat in the Japanese countryside.