One of Japan’s Ancient Hot Spring Resorts
Shirahama Onsen is one of Japan’s oldest hot spring resorts and is traditionally counted among the Three Ancient Hot Springs of Japan, together with Dogo Onsen and Arima Onsen.
In ancient times, Shirahama’s hot springs were known as Muro-no-Yu or Muro Hot Spring. They are mentioned in historic Japanese texts such as the Nihon Shoki (Chronicles of Japan) and the Manyoshu, Japan’s oldest major anthology of poetry. The area is also associated with visits by members of the imperial family and aristocracy, who are said to have traveled here to enjoy the healing waters.
Located in the heart of the historic Yunozaki Onsen district, Muro-no-Yu offers travelers a chance to experience this long tradition of Japanese bathing culture firsthand.
Enjoy Two Different Hot Spring Sources
The most distinctive feature of Muro-no-Yu is that visitors can experience two different hot spring sources at the same bathhouse. The bathing area has two large tubs, each filled with naturally flowing water from a different source.
One bath uses the famous Mabuyu Source, while the other uses the Miyuki Source, which is also used at Saki-no-Yu. Because each source has its own mineral composition, temperature, aroma, and character, visitors can enjoy comparing the two waters during a single visit.
Mabuyu Source: A Rich and Powerful Shirahama Hot Spring
The Mabuyu Source is one of the signature hot spring sources of the Yunozaki area. It is classified as a sulfur-containing sodium-chloride highly saline hot spring, with water emerging from underground at approximately 74°C and a flow rate of around 190 liters per minute.
The water is rich in salt and has a distinctive hot spring character, accompanied by a gentle sulfur aroma. Its warmth penetrates deeply into the body, and the soothing sensation can continue long after leaving the bath.
The source is also known for its rich mineral content and the appearance of yunohana, or natural mineral deposits that form in hot spring water. These features add to the authentic atmosphere of bathing in a traditional Japanese onsen.
The water has traditionally been enjoyed for its potential benefits for conditions such as sensitivity to cold, certain skin problems, and minor cuts. As with other hot springs, these traditional claims should not be considered a substitute for medical treatment.
Miyuki Source: A Gentle Spring with Imperial Connections
The other bath uses the Miyuki Source, the same source used at Saki-no-Yu. It is considered one of the oldest hot spring sources in Shirahama and has a long history associated with the imperial court. According to tradition, emperors also visited the area and bathed in its waters in ancient times.
The spring is classified as a sodium-chloride and bicarbonate hot spring. Its water is clear and has a soft, gentle texture. The mildly alkaline water is particularly pleasant on the skin, leaving a smooth and refreshing sensation after bathing.
The spring has traditionally been valued for its potential soothing effects on ailments such as neuralgia, joint pain, chronic skin conditions, and sensitivity to cold. For many visitors, its gentle texture provides a relaxing contrast to the stronger character of the Mabuyu Source.
Experience the Historic Atmosphere of Yunozaki
Muro-no-Yu stands prominently among the traditional inns and hotels of the Yunozaki Onsen district. Its nostalgic appearance preserves the atmosphere of an old-fashioned Japanese hot spring town.
Several places connected with Shirahama’s hot spring heritage can be found nearby, including Saki-no-Yu and the Miyuki Source. Exploring the area on foot and visiting several hot spring sites is a wonderful way to experience the character of Shirahama.
As steam rises from the baths and the subtle scent of sulfur fills the air, even a simple walk through the neighborhood can provide an authentic taste of traditional Japanese onsen culture.
Yuzaki Tunnel and the Modern History of Shirahama
Immediately east of Muro-no-Yu stands Yuzaki Tunnel, which was completed in 1935. The tunnel played an important role in connecting the Shirarahama and Yunozaki areas.
From the Taisho period through the early Showa period, new hot spring development around Shirarahama helped the area grow into a popular tourist destination. However, the newer Shirarahama area and the older Yunozaki hot spring district were separated by a mountain, making travel and interaction between the two areas relatively difficult.
The completion of Yuzaki Tunnel created a convenient connection between the districts and helped encourage the development of Shirahama as a unified hot spring resort.
Today, the tunnel’s historic stonework and distinctive entrance remain, offering visitors an interesting glimpse into the modern history of Shirahama and the development of its tourism industry.
A Must-Visit Hot Spring for Onsen Enthusiasts
Muro-no-Yu is much more than a place to take a bath. It is a destination where visitors can experience the long history, traditions, and culture of Shirahama Onsen.
The chance to enjoy two different natural hot spring sources in one location, the ancient heritage of the waters, and the nostalgic atmosphere of the Yunozaki Onsen district all make Muro-no-Yu a memorable stop for travelers exploring Shirahama.
If you visit Shirahama, take some time to stop at Muro-no-Yu and relax in its historic waters. Soaking in a traditional Japanese hot spring while surrounded by the atmosphere of an old onsen town is a wonderful way to slow down and experience a different side of Japan.
Muro-no-Yu Visitor Information
Hot Spring Type
Bathing style: Naturally flowing hot spring water from two different sources
Hot Spring Sources
Source 1: Sulfur-containing sodium-chloride highly saline hot spring (Mabuyu Source)
Source 2: Sodium-chloride and bicarbonate hot spring (Miyuki Source)
Traditional Benefits
Traditionally valued for: Neuralgia, joint pain, chronic skin conditions, sensitivity to cold, minor cuts, and other ailments.
Access
By public transportation: From JR Shirahama Station, take a bus for approximately 15 minutes and get off at the Yunozaki bus stop. Muro-no-Yu is about a 2-minute walk from the bus stop.
By car: Approximately 15 minutes from the Nanki-Shirahama Interchange on the Kisei Expressway.
Experience the Ancient Hot Spring Culture of Shirahama
With its two distinctive hot spring sources and centuries of history, Muro-no-Yu is an ideal destination for travelers who want to experience authentic Japanese onsen culture. Combine your visit with a walk through Yunozaki and nearby historic hot spring sites to discover the enduring charm of Shirahama.