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“Eagle’s Bath: 100°C Finnish-style sauna with black water bath & outdoor open-air bath in Yokohama, Kanagawa – ‘Keikyu Koyasu’s Deep Sento Home Sauna'”

2025.07.08

[Kanagawa Prefecture, Yokohama City] Washi no Yu | 100°C Finnish Style x Black Water Bath & Outdoor Air Bath for 'Keikyu Koyasu's Deep Sento Home Sauna'

Washi no Yu, a Hidden Gem in Yokohama, Kanagawa Prefecture

Located in Yokohama City, Kanagawa Prefecture, “Washi no Yu” is known as a beloved local sento with a deep connection to the community. The highlight is the combination of a Finnish-style sauna and a black water bath. After sweating it out in the sauna, which exceeds 100°C, you can cool down in the black water bath, which uses natural radium hot spring water sourced from 200 meters underground. This perfect balance between sauna and water bath captivates many sauna enthusiasts.

Additionally, there is an outdoor space where you can enjoy an open-air bath, providing excellent relaxation. The convenient location, just a 3-minute walk from Keikyu Koyasu Station, makes it an attractive spot to refresh both body and mind away from the hustle and bustle of the city. Furthermore, as a “town healing spot,” this facility contributes to health promotion, and once you visit, you’ll surely be captivated by its charm.

At Washi no Yu, shampoo and body soap are provided, allowing you to visit with ease, even empty-handed. However, please note that you need to bring your own towel. Other convenient facilities such as hairdryers and lockers are also available, ensuring a comfortable experience even for first-time visitors. Enjoy an exquisite relaxation time that lets you forget the everyday hustle at Washi no Yu, equipped with such comprehensive facilities and services.

The Charm of Washi no Yu

Located in Yokohama City, Kanagawa Prefecture, “Washi no Yu” is an ideal place for sauna enthusiasts and hot spring fans. This sento is conveniently located just a 4-minute walk from Keikyu Koyasu Station. With attractions like the “Hokutolite Bath” from Tamagawa Onsen in Akita Prefecture and the black water bath, many people visit seeking relaxation.

100°C Finnish Style Sauna

At Washi no Yu, you can experience the Finnish-style sauna known for its high temperatures. This sauna is set at approximately 100°C, allowing you to thoroughly warm your body. Sweating in the high-temperature environment helps expel toxins from your body, offering detoxification benefits. Additionally, the sauna has a spacious interior, providing a relaxing environment.

Cool Down in the Black Water Bath

After sweating it out in the sauna, cool down in the black water bath. This bath uses black water rich in natural ingredients, which is gentle on the skin. Immersing yourself in the cold water bath promotes blood circulation and boosts metabolism. Moreover, it enhances your body’s temperature regulation function, contributing to health improvement.

Outdoor Air Bath Space

Washi no Yu also features an outdoor air bath space. Here, you can relax while feeling the natural air, refreshing both body and mind. Outdoor air baths are ideal for regulating body temperature after a sauna, and their effects are significant. Especially at night, you can enjoy a quiet time under the starry sky, making it the perfect space to unwind after a long day.

Facilities and Amenities

Washi no Yu offers a variety of services and amenities. First, there is a dedicated parking lot for bathers (50 cars), so you can visit with peace of mind even by car. Additionally, the changing rooms and rest areas are spacious, providing a comfortable environment for use.

Dining Corner

The facility also has a light meal corner. Here, you can enjoy beer, soft drinks, and snacks that are perfect after a bath. This dining corner is highly rated by many customers for enhancing relaxation time.

Immaculately Clean Facilities

Washi no Yu is characterized by its immaculately clean facilities. Regular cleaning and maintenance ensure constant cleanliness, providing each customer with a comfortable experience. Additionally, disinfectants are available in the changing rooms and bath areas, ensuring thorough safety measures.

Visitor Reviews

Washi no Yu receives high praise from many customers. The reasons cited include “affordable pricing” and “comprehensive facilities.” Many customers are satisfied with the “super sento level at sento prices.” Additionally, there are many comments about “friendly staff” and “clean facilities.”

Access Information

Access to Washi no Yu is very convenient. It is a 4-minute walk from Keikyu Koyasu Station and an 8-minute walk from Oguchi Station, making it popular among many customers. Additionally, there are numerous tourist spots nearby, such as Oguchi Shopping Street and Daini Keihin, making it an area where you can enjoy a full day.

As a unique relaxation spot in Yokohama City, Kanagawa Prefecture, be sure to visit at least once.

Frequently Asked Questions about Washi no Yu

What are the features of Washi no Yu?

Washi no Yu is a sento located in Kanagawa Ward, Yokohama City, popular for its Finnish-style sauna and black water bath. The sauna is set at approximately 100°C, allowing you to sweat thoroughly. The water bath uses natural black water, known to be gentle on the skin. Additionally, there is an outdoor air bath, allowing you to spend a relaxing time.

What is a Finnish-style sauna?

A Finnish-style sauna is characterized by high temperature and low humidity, allowing you to thoroughly warm your body. In this style of sauna, you can also temporarily increase humidity by pouring water on the stove to generate steam. At Washi no Yu, you can enjoy a pleasant sweat using this traditional method, which is highly rated by many users.

What is a black water bath?

A black water bath uses black-colored water, as the name suggests. It is a natural hot spring drawn from underground, rich in mineral content, and has a smooth feel on the skin. It is popular for its potential benefits for fatigue recovery and skin.

What is the appeal of the outdoor air bath?

In the outdoor air bath, you can bathe while feeling nature, refreshing both body and mind. You can enjoy the scenery of each season, making it worth visiting all year round. Additionally, bathing with fresh air allows for a more relaxing time.

What benefits can be expected?

At Washi no Yu, alternating between the high-temperature sauna and cold water bath is expected to promote blood circulation and boost metabolism. Additionally, the black water rich in natural ingredients is anticipated to provide moisturizing effects for the skin. These help relieve the fatigue and stress accumulated in daily life.

How can I access it?

Washi no Yu is within walking distance from Keikyu Koyasu Station, making access very convenient. It is easy to visit using public transportation, making it popular among many people. Additionally, parking is available, so you can visit with peace of mind by car.

Conclusion

“Washi no Yu” in Yokohama City, Kanagawa Prefecture, is an attractive sento with three main features: a Finnish-style sauna, a black water bath, and an outdoor air bath space. After thoroughly warming your body in the high-temperature sauna, you can cool down in the black water bath rich in natural ingredients, which is expected to promote metabolism. Furthermore, the outdoor air bath space allows you to relax while feeling nature, refreshing both body and mind. The convenient access and comprehensive facilities are also highly rated by many customers. With shampoo and body soap provided, you can visit empty-handed, which is another appealing point. The convenience of being just a 3-minute walk from Keikyu Koyasu Station makes it a beloved spot for many. “Washi no Yu” is an ideal relaxation spot to relieve everyday fatigue, making it an indispensable place for many sauna enthusiasts.

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