Rishiri Fuji Onsen (利尻富士温泉)

Introduction: The Climber’s Reward at the Foot of the Northern Fuji

Nestled at the base of the majestic Mt. Rishiri (often called “Rishiri Fuji” for its perfect volcanic cone), Rishiri Fuji Onsen (利尻富士温泉) is the ultimate sanctuary for hikers and nature lovers. Located in the Oshidomari district—the main gateway to the island—this hot spring is the first and last stop for many international travelers. After a grueling 10-hour round-trip hike to the 1,721-meter summit, there is no greater luxury than submerging into these clear, mineral-rich waters. While its sister spring in Kutsumagata is famous for its dark iron color, Rishiri Fuji Onsen is celebrated for its clarity, its skin-softening bicarbonate content, and its proximity to the island’s most stunning forest trails. For the global adventurer, this onsen is the perfect “Base Camp” for exploring the northern frontier.

Key Information Table

The Healing Waters: The “Silk Water” of the Volcano

The water at Rishiri Fuji Onsen is a Sodium-Hydrogen Carbonate / Chloride Spring. Unlike the reddish-brown waters on the other side of the island, this spring is high in bicarbonate ions, which act as a natural, mild soap. It emulsifies skin oils and dissolves old keratin, leaving your skin feeling silky smooth—this is the classic “Bijin-no-yu” or “Beautiful Skin Spring.” For climbers, the chloride content is equally important; it forms a mineral veil that traps heat in the muscles, aiding in the rapid recovery of tired legs and joints after a vertical ascent. The facility features a large indoor panoramic bath and a cypress-wood outdoor bath (Rotenburo) that offers a glimpse of the forest at the foot of the mountain.

Top Recommended Stays & Bases

• Rishiri Fuji Kanko Hotel: One of the island’s largest and most established hotels, located near the ferry terminal. It offers excellent logistics for hikers and features its own spacious onsen facilities utilizing the local spring.
• Island Inn Rishiri: A modern, resort-style hotel with comfortable Western-style bedding options and spectacular views of the sunset over the sea.
• Ryokan Fuji: A traditional Japanese inn near the Oshidomari harbor, known for its incredible “Kaiseki” dinners featuring local abalone and sea urchin.
• Rishiri Fuji Onsen Facility (Day-trip): This is the social hub for hikers. It has a rest area with tatami mats where you can nap after your hike before catching the evening ferry.

Must-Visit Neighborhood Spots: Peak Views and Coastal Beauty

Mt. Rishiri (Summit Trail): The trailhead is just minutes from the onsen. Even if you don’t hike to the top, a short walk to the “Third Station” provides beautiful views of the alpine flora.
Pesy-misaki (Cape Pesy): A massive rock formation near Oshidomari harbor. A 15-minute climb to the top offers a 360-degree view of the town, the mountain, and the ocean.
Hime-numa (Princess Pond): A legendary caldera lake that reflects Mt. Rishiri on its surface like a mirror. It is a 10-minute drive from the onsen and features a beautiful wooden boardwalk trail.

Local Gastronomy: The Taste of the Deep North

Oshidomari is a hub for high-end seafood processing.
Uni-don (Sea Urchin Bowl): The ultimate local meal. The “Bafun-uni” (short-spined sea urchin) is considered the most luxurious variety in Japan.
Rishiri Konbu Ice Cream: A unique local treat. It is a vanilla soft-serve flavored with salty kelp powder and topped with a piece of dried kelp. It’s a fascinating sweet-and-salty “Umami” experience.
Vegetarian/Vegan Survival: Visit the local Rishiri Kelp Processing Centers to buy 100% vegan snacks like shredded kelp and kelp soup stock. For meals, look for “Vegetable Tempura” or “Cold Soba.” Most local restaurants are happy to serve plain rice and local vegetables if you explain your dietary needs.

Cultural & Historical Context

The town of Oshidomari (利尻富士町) takes its name from the mountain, reflecting how the volcano is the center of the residents’ spiritual and economic lives. Historically, Rishiri was a place where Ainu hunters and Wajin traders met to exchange furs and kelp. The onsen was developed in the late 20th century to turn the island into a world-class trekking destination, and it now serves as the “Living Room” for the global climbing community that visits every summer.

Practical Travel Tips for International Visitors

• Tattoo Policy: The main public facility is very accustomed to international hikers. Small tattoos are generally not an issue. For large tattoos, consider visiting during the quieter afternoon hours (1:00 PM – 3:00 PM) or check if your hotel offers a private bath.
• Ferry Logistics: Oshidomari is the busiest port. Most ferries from Wakkanai arrive here. The onsen facility is close enough that you can walk from the harbor if you don’t have heavy luggage (about 15-20 mins).
• Cash & Connectivity: Major hotels take cards, but cash is king at the public bath and local ramen shops. Free Wi-Fi is available at the Oshidomari Ferry Terminal and the Onsen lobby.
• Hiking Safety: Mt. Rishiri is a serious mountain. Even in summer, weather can change in minutes. Always check the forecast at the onsen visitor center before starting your climb.

2025-2026 Latest Updates

In 2025, Rishiri Fuji Onsen introduced a “Climber’s VIP Pass,” offering discounted bathing for those who show a photo of themselves at the Mt. Rishiri summit. For the 2026 season, the facility is upgrading its “Outdoor Foot Bath” (Ashiyu) to be accessible 24 hours, allowing travelers to rest their feet while looking at the stars.

Safety & Manners

In the onsen, always wash your body thoroughly before entering the tub. This is especially important for hikers who may be sweaty or dusty. Do not bring hiking gear into the locker room; use the designated large lockers or the front desk storage. Finally, be mindful of “Thermal Fatigue.” After a long hike, your body is dehydrated—drink at least 500ml of water before and after your bath to stay safe.