Keiyama Hot Spring (Hokkaido) Complete Guide | Hot Spring Quality, Benefits, Access, and Surrounding Attractions Thoroughly Explained
Keiyama Hot Spring is a historic hot spring situated at the foot of Keiyama, an active volcano that continues to emit volcanic smoke, located at the tip of the Oshima Peninsula in the southeastern part of Hakodate City, Hokkaido. This hot spring resort, designated as a National Health Resort Hot Spring, is characterized by its strongly acidic reddish-brown waters and spectacular views overlooking the Tsugaru Strait. This article provides a thorough explanation of everything you should know before visiting Keiyama Hot Spring, including its spring quality, benefits, access methods, and surrounding tourist attractions.
What is Keiyama Hot Spring? Basic Information and Characteristics
Keiyama Hot Spring is a hot spring resort located approximately 50 kilometers east of Hakodate city center, about one hour by car. Mount Keiyama, standing at 618 meters, is known as a rare active volcano in Hokkaido, with white volcanic smoke still rising from its slopes. The hot spring created by this volcanic activity has long been cherished by local residents and mountain climbers.
The Keiyama Hot Spring area is a collective term for “Keiyama Hot Spring” and “Mizunashi Kaihama Hot Spring” located along the coastline. Situated within Keiyama Prefectural Natural Park, this hot spring resort was designated as a National Health Resort Hot Spring in 1963 due to its rich natural environment. This designation is granted to hot spring resorts that meet high standards in spring quality, environment, and conditions suitable for recuperation, confirming the excellent quality of Keiyama Hot Spring.
Composition of Keiyama Hot Spring Area
The Keiyama Hot Spring area is primarily composed of two hot spring locations.
Keiyama Hot Spring is positioned about 200 meters above sea level, halfway up the Keiyama hiking trail. The Tsugaru Strait spreads below, and on clear days, one can see as far as Shimokita Peninsula in Aomori Prefecture. Keiyama Hot Spring Inn operates as a sole lodging facility, boasting over 90 years of history as an established inn.
Mizunashi Kaihama Hot Spring is a rustic open-air bath located on the wave-swept shore of Cape Keiyama. This unusual hot spring allows bathing only during certain hours determined by tidal movements—making it known among hot spring enthusiasts as a “hidden gem.” It is within walking distance of Keiyama Hot Spring Inn, with many tourists enjoying both springs.
Spring Quality and Benefits of Keiyama Hot Spring
The greatest characteristic of Keiyama Hot Spring is its intense acidity. With a pH value of 2.2—equivalent to lemon juice—it is known as one of the most acidic hot springs in Japan.
Detailed Spring Quality Data
Keiyama Hot Spring’s spring quality is classified as acidic, iron-containing, aluminum, sulfate spring. Also called “acidic alum-vitriol spring,” it has the following characteristics:
- pH Value: 2.2 (strongly acidic)
- Dissolved Solids: approximately 4,923 mg/kg
- Metasilicic Acid: 263 mg/kg
- Spring Temperature: high temperature at source
- Color: reddish-brown due to high iron content
- Aroma: characteristic sulfur scent
With dissolved solids exceeding 4,000 mg, it is evident that the hot spring mineral content is extremely concentrated. The abundance of metasilicic acid makes it notable as a hot spring with expected beauty benefits.
Luxury of 100% Source Flowing Bath
Keiyama Hot Spring Inn provides this rare hot spring at 100% source flow without circulation or added water. This pure hot spring allows guests to fully experience the original benefits of the water. Mineral deposits crystallize on the edges of the bath, allowing visitors to visually experience the strength of the spring.
Expected Benefits
Strongly acidic hot springs possess high sterilizing properties, with the following benefits expected:
General Therapeutic Benefits:
- Neuralgia
- Muscle pain
- Joint pain
- Frozen shoulder
- Motor paralysis
- Joint stiffness
- Bruises
- Sprains
- Chronic gastrointestinal disease
- Hemorrhoids
- Poor circulation
- Post-illness recovery period
- Fatigue recovery
- Health promotion
Spring Quality-Specific Therapeutic Benefits:
- Chronic skin disease
- Chronic gynecological disease
- Cuts
- Burns
- Frail children
- Chronic rheumatism
The efficacy for skin diseases has long been known, with many guests seeking treatment for atopic dermatitis and eczema. Additionally, the strong acidity provides astringent action that tightens the skin, with beauty benefits also expected.
Precautions for Bathing
While strongly acidic hot springs offer high therapeutic benefits, the stimulation is also strong, requiring attention to the following:
- Those with sensitive skin should keep bathing time brief
- Avoid getting spring water in eyes or mucous membranes
- Thoroughly rinse with fresh water after bathing (remaining mineral content can cause irritation)
- Remove metal accessories as they may become discolored
- Avoid prolonged bathing and adjust duration according to physical condition
Access to Keiyama Hot Spring
As Keiyama Hot Spring is located away from Hakodate city center, it is important to confirm access methods in advance.
Address and Basic Information
Keiyama Hot Spring Inn
- Address: 146 Kashiwano-cho, Hakodate City, Hokkaido
- Phone: 0138-84-2650
Access by Car
Car access is most convenient, with the following route being standard:
From Hakodate City Center:
- Head southeast on National Route 278
- Approximately 50 km, approximately 1 hour travel time
- Approximately 45.7 km from Hakodate Airport
From JR Hakodate Station:
- Approximately 52 km, approximately 1 hour 14 minutes travel time
While roads are well-maintained, winter requires caution regarding snow and icy road conditions. Particularly around Keiyama, increased elevation means special attention to studless tires and winter equipment is necessary.
Access by Public Transportation
For public transportation, utilize Hakodate Bus.
From Hakodate Station:
- Board Hakodate Bus heading to “Keiyama Misaki”
- Get off at “Keiyama Hiking Trail” or “Kashiwano” bus stop
- Approximately 2 hours travel time
- With limited bus operations, it is recommended to check the schedule in advance
Bus operations run only a few times daily, so if staying overnight, it is wise to confirm shuttle service availability with the inn.
Utilizing Rental Cars
Renting a car from Hakodate Airport or Hakodate Station allows for efficient touring of both Keiyama Hot Spring and surrounding attractions. Particularly if planning to visit multiple locations like Mizunashi Kaihama Hot Spring or Mount Keiyama’s summit, a rental car is convenient.
Accommodation Facilities at Keiyama Hot Spring
Accommodation options in the Keiyama Hot Spring area are limited, with main choices as follows:
Keiyama Hot Spring Inn
“Keiyama Hot Spring Inn” is a sole lodging representing Keiyama Hot Spring. This established inn boasts over 91 years of history, with a charm found in its family-like and rustic atmosphere.
Features:
- All guest rooms overlook the Tsugaru Strait with spectacular views
- 100% source-flowing hot spring
- Regional cuisine using local ingredients
- Summer breakfasts featuring seasonal squid
- Ideal base for Mount Keiyama climbing
- Day-use bathing available (confirm operating hours)
Rates for one night with two meals are offered from the 6,000 yen range (6,600 yen and up including consumption tax). With approximately 97-person capacity, it is popular with mountain climbers and hot spring therapy guests.
Keiyama Cape Hot Spring Hotel
“Keiyama Cape Hot Spring Hotel,” situated at the tip of Keiyama Cape on the coastline, is another option. Located near wave-washed shores, bathing with spectacular Tsugaru Strait views is possible. This establishment also offers 100% source-flowing hot spring with good access to Mizunashi Kaihama Hot Spring.
Day-Use Bathing
Enjoying the hot spring without overnight stay is also possible. Keiyama Hot Spring Inn offers day-use bathing, though operating hours and fees should be confirmed in advance. Particularly during busy periods or with group guests, day-use bathing may be unavailable, requiring caution.
Mount Keiyama Climbing and Nature
When visiting Keiyama Hot Spring, be sure to attempt Mount Keiyama climbing. Though standing at only 618 meters in elevation, it offers rugged landscapes unique to active volcanoes and abundant alpine flora.
Characteristics of Climbing Courses
Mount Keiyama has multiple climbing routes, with the course departing from Keiyama Hot Spring being most popular.
Beginner Course:
- Approximately 1.5 to 2 hours from trailhead to summit
- Well-maintained hiking trail
- Volcanic landscape characteristic of active volcanoes
- Direct observation of white smoke from fumaroles possible
From the summit, 360-degree panoramic views stretch across the Tsugaru Strait, Shimokita Peninsula, and on clear days, even to Mutsu Bay in Aomori Prefecture.
Keiyama Azalea Peak Season
Mount Keiyama is also famous as an “azalea mountain,” with the entire mountain turning deep crimson from mid-May to early June. The spectacular sight of approximately 600,000 Ezo wild azaleas and false hellebore blossoms is breathtaking.
During this period, “Keiyama Azalea Festival” is held, attracting numerous visitors. This is the best season for simultaneously enjoying hot springs, climbing, and flower viewing.
Treasure Trove of Alpine Plants
Despite modest elevation, Mount Keiyama’s volcanic soil and harsh weather conditions create exceptional alpine flora diversity. Rock saxifrage, pink mountain heath, Chisima cranesbill, and other plants unique to Hokkaido can be observed.
Climbing Precautions
- Watch for volcanic gas due to active volcano status
- Prepare for sudden weather changes
- Submission of climbing notification recommended
- Winter snow makes climbing difficult
- Verify volcanic alert level beforehand
Mizunashi Kaihama Hot Spring | Hidden Gem at Wave-Washed Shore
The other attraction of Keiyama Hot Spring area is “Mizunashi Kaihama Hot Spring” located along the coastline.
Hot Spring Changing with Tidal Movements
Mizunashi Kaihama Hot Spring is, as the name suggests, an outdoor bath welling up at the wave-washed shore. During high tide, seawater submerges the bath, allowing bathing only for several hours around low tide—an unusual hot spring.
Features:
- Free bathing
- 24-hour open (attention to tidal levels required)
- Mixed bathing (swimsuit recommended)
- No changing rooms or shelter structures
- Rustic atmosphere in natural state
Access and Precautions
Accessible on foot from Keiyama Hot Spring Inn. Before bathing, confirm low tide times using a tide table. Since no facilities exist, towels and change of clothes must be brought. On days with high waves or poor weather, bathing is inadvisable.
Tourist Attractions Around Keiyama Hot Spring
Using Keiyama Hot Spring as a base, nearby attractions can also be enjoyed.
Keiyama Cape
Located at the southeasternmost tip of Oshima Peninsula, this cape features sheer cliffs and rugged coastline. Hiking trails are developed around the lighthouse, offering magnificent Tsugaru Strait views.
Keiyama Seashore Park
A seaside park with developed facilities and camping grounds. Summer sees families enjoying swimming and camping.
Hiura Cape
A scenic location on the route returning toward Hakodate from Keiyama. Unusual rock formations line the coast with excellent observation deck views—ideal as a driving rest spot.
Todohokke District
A fishing village approximately 15 minutes by car from Keiyama Hot Spring. Direct sales shops and restaurants offer fresh seafood, particularly exceptional uni and squid.
Keiyama Michi-no-Eki “Natowa-Esan”
A roadside station selling local specialties, fresh vegetables, and seafood. Stopping here while heading to Keiyama Hot Spring is recommended for purchasing souvenirs.
Nearby Hot Springs Around Keiyama Hot Spring
Beyond Keiyama Hot Spring, charming hot springs dot the surroundings.
Yunokawa Hot Spring
One of Hokkaido’s premier hot spring towns near Hakodate city center. Approximately one hour by car from Keiyama Hot Spring, numerous hotels and inns line the streets. The chloride spring has soft water different from Keiyama’s acidic springs.
Yajigashira Hot Spring
A public bathhouse at the foot of Mount Hakodate. Its retro building and brownish-colored chloride spring attract both visitors and locals alike.
Onuma Hot Spring
Located within Onuma Quasi-National Park, approximately 1.5 hours by car from Keiyama Hot Spring. This offers the luxury of hot spring bathing amid Onuma’s natural beauty.
History and Culture of Keiyama Hot Spring
Mount Keiyama has long been an object of worship. The Ainu people called it “Esaunupuri” (cape mountain) and held it in reverent respect.
Shugendo Training Ground
During the Edo period, it flourished as a Shugendo training site, with many ascetics visiting for spiritual practice. Stone monuments and shrines remain throughout the mountain, allowing visitors to sense its religious heritage.
As a Power Spot
Recently, Mount Keiyama has gained attention as a power spot. Its volcanic energy combined with its spiritual mountain history is said to provide special sensations to visitors.
Tips for Enjoying Keiyama Hot Spring
Best Seasons
Spring (Mid-May to Early June): Keiyama azaleas bloom brilliantly—the most beautiful season. Enjoy climbing, hot springs, and flower viewing simultaneously.
Summer (July-August): Beautiful fresh greenery with abundant seafood. Tourist crowds are large, so reserve accommodations early.
Autumn (September-October): Beautiful autumn foliage with fewer crowds. Relish hot springs leisurely.
Winter (November-March): Snowfall makes climbing difficult, though snow-viewing hot spring bathing is possible. Note road conditions carefully.
Sample Itinerary Plans
Two-Day, One-Night Course:
- Day 1: Arrive in Hakodate → Travel to Keiyama Hot Spring → Bathe in hot spring → Dinner
- Day 2: After breakfast, Mount Keiyama climbing → Mizunashi Kaihama Hot Spring → Return to Hakodate
Three-Day, Two-Night Course:
- Day 1: Arrive in Hakodate → Travel to Keiyama Hot Spring → Explore surroundings → Hot spring
- Day 2: Mount Keiyama climbing → Mizunashi Kaihama Hot Spring → Seafood lunch at Todohokke district
- Day 3: Morning bath → Keiyama Cape sightseeing → Hakodate city center sightseeing
Packing Checklist
- Hiking boots (for Mount Keiyama climbing)
- Warm clothing (high elevation and strong winds)
- Swimsuit (for Mizunashi Kaihama Hot Spring)
- Camera (for scenic photography)
- Tide table (for Mizunashi Kaihama Hot Spring)
- Sunscreen (summer)
- Insect repellent (summer)
Local Cuisine and Dining
Keiyama Hot Spring Inn serves regional cuisine utilizing local ingredients.
Fresh Seafood
Fresh fish and seafood caught in the Tsugaru Strait are prized. Particularly noteworthy is seasonal squid offered at summer breakfasts—a distinctly Hakodate taste enjoyed as sashimi, salted squid, and in various preparations.
Hokkaido Mountain Produce
Beyond seafood, abundant Hokkaido vegetables, mushrooms, and wild plants feature prominently. Seasonal menus vary, never becoming monotonous despite repeated visits.
Nearby Dining Options
The Todohokke district contains restaurants and direct sales shops featuring fresh seafood. Uni rice bowls, squid sashimi, grilled atka mackerel, and other Hakodate-style seafood cuisine can be savored.
Summary: Attractions of Keiyama Hot Spring
Keiyama Hot Spring is a quality hot spring situated in what might be called a remote location in Hakodate City, Hokkaido—a gem known to those in the know. Its strongly acidic reddish-brown waters represent rare spring quality in Japan with significant therapeutic benefits. Spectacular views overlooking the Tsugaru Strait, the rugged nature of an active volcano, rustic hot spring bathing at wave-washed shores, and magnificent azaleas from May through June—all comprise attractions unique to Keiyama Hot Spring.
Though somewhat distant from Hakodate city center, this distance provides an environment far removed from urban bustle where one can thoroughly refresh both body and mind. Combining climbing or hiking enhances the travel experience considerably.
Designated as a National Health Resort Hot Spring, Keiyama excels in spring quality, natural environment, and conditions as a recuperation destination. When visiting Hokkaido, be sure to make the effort to experience this hidden quality hot spring. The sunset view of the Tsugaru Strait glimpsed while immersed in strongly acidic waters will surely become an unforgettable memory.
