Rishiri Onsen (利尻温泉)

Rishiri Onsen: A Volcanic Healing Sanctuary at the Edge of the Northern Sea

Rising like a floating fortress from the Sea of Japan, Rishiri Island is dominated by the majestic cone of Mt. Rishiri, often called “Rishiri-Fuji” for its striking resemblance to Japan’s iconic peak. Rishiri Onsen is a destination for the true explorer—a thermal oasis born from the deep volcanic roots of this northern sentinel. Located in the northernmost reaches of Hokkaido, this hot spring area offers a surreal blend of rugged alpine scenery and high-mineral waters that have been a source of vitality for the island’s fishing and pioneering communities. Whether you are returning from a grueling summit hike or seeking a quiet moment as the sunset paints the ocean in shades of deep purple, Rishiri Onsen provides a restorative sanctuary where the air is pure, the water is medicinal, and the sense of isolation is profoundly peaceful.

Key Information

The Healing Waters: Carbonated Purity and “Heat Retention” Science

The waters of Rishiri Onsen are geologically unique, gushing from the volcanic strata at the foot of Mt. Rishiri. Scientifically classified as a sodium-chloride and bicarbonate spring, the water is particularly famous for its high concentration of free carbon dioxide. These “Bubbly Waters” help to expand peripheral blood vessels, promoting blood flow and warming the body from the core with remarkable efficiency. The salt content forms a protective mineral layer on the skin, which prevents the evaporation of sweat and ensures that bathers remain warm long after leaving the tub—a critical feature for survival in the sub-arctic climate of northern Hokkaido. Often referred to as “The Water of Eternal Youth” by locals, the springs also have a “skin-beautifying” effect, gently removing excess oils and leaving the skin feeling hydrated and refreshed.

Top 5 Recommended Ryokans

• Rishiri Marine Hotel (Heritage/View): A premier seaside hotel offering expansive views of the Sea of Japan. Its baths are famous for their transparency and mineral purity, and the dinners feature the world-renowned Rishiri sea urchin.
• Hotel Rishiri (Scale/Convenience): Located near the Kutsugata port, this large resort hotel offers a variety of public and private bathing options. It is an ideal base for group travelers and families seeking standard amenities.
• Island Inn Rishiri (Boutique/Modern): A refined, stylish hotel that prioritizes privacy and personalized service. It features modern design suites and a quiet onsen area designed for deep meditation.
• Rishiri Fuji Kanko Hotel (Authentic/Toji): A classic establishment that focuses on traditional Japanese hospitality. It is favored by hikers and nature enthusiasts for its warm atmosphere and proximity to the Oshidomari trailhead.
• Ryokan Taniguchi (Traditional Boutique): A smaller, more intimate Japanese guesthouse known for its world-class seafood cuisine and traditional architecture.

Must-Visit Public Baths (Soto-yu)

The Rishirifuji Onsen is the town’s primary public bathing facility and a mandatory stop for day-trip visitors. For a modest fee of 600 yen, you can experience natural mineral pools, including a large outdoor rock bath that offers a clear view of the “Rishiri-Fuji” summit. It maintains a warm, community-led atmosphere where you can chat with the island’s kelp farmers and fishermen. Additionally, the Kutsugata Misaki Park Footbath is a free public facility where you can soak your feet while watching the ferries cross the harbor under the northern sky.

Walking Guide & Scenic Spots

Exploration starts with the Hime-numa Pond Trail, a gentle 1-kilometer boardwalk through primary forest that offers the most iconic reflection of Mt. Rishiri in its mirrored waters. For a wider view, visit Otatomari Pond, the largest lake on the island, surrounded by a carpet of alpine flora in summer. For serious adventurers, the Mt. Rishiri Summit Hike is a 10-to-12-hour round trip through one of the most rugged alpine environments in Japan. In winter, the island becomes a silent world of “Snow Monsters” and frozen ponds, perfect for snowshoeing tours and watching the migratory eagles that gather along the cliffs.

Local Gastronomy & Souvenirs

Rishiri is the “Kelp Kingdom” of Japan. You must try the Rishiri sea urchin (Uni), which is prized across the country for its sweet flavor derived from a diet of premium Rishiri kelp. Visit Kamui Seaside Park to try “Sea Urchin Catching,” where you can harvest your own uni and eat it fresh on the spot. Another local specialty is Rishiri Ramen, which uses a deep, savory broth made from island-harvested kelp. For souvenirs, look for Rishiri Kelp Soup Packs, original “Kelp Ice Cream,” and hand-crafted woodcarvings that represent the island’s pioneering spirit.

Cultural & Historical Context

The Ainu people have long revered Mt. Rishiri as a sacred mountain, calling it Ri-shiri (High Island). In Ainu mythology, the mountain is the physical embodiment of a forest spirit who guards the northern seas. Japanese development began in the Meiji era as a base for herring and kelp fishing. Today, the island is a model of Sustainable Maritime Culture, with strict regulations protecting the kelp beds that fuel the island’s economy and its world-class seafood. The connection between the volcanic activity of the peaks and the abundance of the surrounding seas is a central theme of island life.

Practical Travel Tips

Transportation: While buses run around the island, renting a car or a bicycle is highly recommended for exploring the remote capes and trailheads efficiently. Seasonality: Summer (June-August) is best for wildflowers and sea urchin; winter (January-February) is for those seeking extreme northern silence and starry skies. Cash: The island is remote; while hotels take cards, the local fishing cooperatives and small ramen shops often only accept Japanese Yen. Tattoos: Most larger hotels are accommodating, but for public facilities, using a waterproof cover sticker is a respectful gesture.

2025-2026 Latest Updates

The Rishiri Island 100th Anniversary Eco-Trail Project is scheduled for completion in late 2025, offering new English-guided trekking routes through the western forest. Additionally, the Rishiri Winter Starlight Festival 2026 will feature expanded nightly telescopes and bonfire events for international visitors seeking to witness the Aurora Borealis, which is occasionally visible during high solar activity years.

Safety & Manners

In the onsen, always rinse thoroughly before entering the communal tub to protect the mineral purity. When hiking Mt. Rishiri, remember that the peak is over 1,700 meters and the weather can change in minutes; always carry a waterproof jacket and a “portable toilet” kit, as there are no facilities on the mountain. Finally, please respect the kelp-drying grounds (found all over the island in summer) by not stepping on the kelp or disturbing the work areas of the local farmers.