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Hot Springs

Genuine natural hot spring『Boukai no Yu"

Shirahama Onsen is one of Japan's Best 3 Ancient Springs.
Among them, you can enjoy "Kanro-no-yu", which is known for its excellent spring quality.
  • Boukai no Yu

    At Bokai Boukai, we aim to provide our guests with a natural hot spring bath that flows directly from the source.
    You can adjust the temperature of the water to your liking.

    In Nozomi- Boukai Yu, you may find floating "yunohana" (sparkle deposits) that are unique to natural hot springs and resemble the yuba skin of tofu.
    Use the wooden mixing stick provided in the bathtub to mix the abundant hot spring water to your liking and enjoy.
    The water becomes softer, allowing you to feel the blessings of nature even more.
  • Spring quality and effects

    Characteristics
    The hot spring at this facility is located in the Yuzaki area, and among the many springs in Shirahama, it is the only one with a spring quality that leaves the skin feeling smooth and silky, making it highly valued.

    Also, as one of the oldest springs in Japan, it has been the home of many emperors, including Saimei, Tenchi, Jito, and Mommu, and the tragic story of Prince Arima is particularly famous here.
    It used to be called "Muro no Ideyu" and this is the source of this "Muro no Ideyu" hot spring. 『Kanro-no-yu"

    The hot springs are natural and the amount of water they produce is very abundant.
    Furthermore, its crystal-clear beauty and amber-like smoothness make it pleasant to the touch, making it a popular beauty hot spring.

    【Spring temperature】85.1℃
    【Spring quality name】Sodium hydrogen carbonate spring
    【Spring quality classification】Weakly alkaline hypotonic hot spring
    Efficacy
    <Bathroom adaptability>
    Neuralgia /Muscle pain /Joint pain /frozen shoulder /motor paralysis /Stiffness in joints /Uchimi /Braking
    chronic gastrointestinal disease /hemorrhoids /Sensitivity to cold /Recovery period /Fatigue recovery /Health Promotion
    Cuts / Burns / Chronic skin diseases / Weak children / Chronic gynecological diseases

    <Suitability for drinking>
    chronic gastrointestinal disease /chronic constipation /gout /Liver disease
  • 【Words from Professor Susumu Nishimura, Ph.D., Professor Emeritus of Kyoto University and Chairman of the Hot Spring Science Society】

    - "Boukai" hot spring -
    You who are currently bathing in this water have taken advantage of this facility, and are you enjoying the benefits of this hot spring?
    The special feature of this bath is that it allows you to fully enjoy the benefits of the "Kanro-no-yu.

    The temperature of the "Kanro-no-yu can be adjusted to suit your taste.
    Users are free to use the hot water to their heart's content.

    "Kanro-no-yu" is the best of all the springs in Shirahama.
    The baths at "Mokai Boukai" are left to the discretion of the user.
    The way the hot spring water settles makes it clear that it is being used in a way that does not damage its quality.
    This is manifested by floating sediment.
    The sediment on the edge of the bathtub is evidence of this.

    Written on the evening of September 8th, 2008.

"Boukai no Yu" User Guide

Hot Springs

Shirahama Onsen (100% natural hot spring)*Artificial hot spring not included

Number of baths

[Location]2nd floor(Men's bath 1, Women's bath 1)
[Indoor bath]Men's Bath:Capacity: 10 people /Women's bath:The capacity: 5 people

Open Hours

15:00 to 24:00 / 6:30 to 9:00

Facilities

Body soap /soap /Rinse-in-shampoo /Hair dryer
*Bath towels are sold at the front desk for 300 yen.

hot spring tax

A separate hot spring tax of 150 yen for adults will be charged.