Shiriuchi Onsen (知内温泉)

Shiriuchi Onsen: Journey to the 800-Year-Old Cradle of Hokkaido’s Thermal History

Shiriuchi Onsen is not merely a hot spring; it is a living chronicle of Hokkaido’s development. Located in the southwestern tail of the island near the Tsugaru Strait, it holds the prestigious title of being the oldest hot spring in Hokkaido, with a documented history stretching back to 1247. For over eight centuries, this secluded sanctuary has remained a steadfast site of healing, surviving the transition from the Kamakura Shogunate to the modern era. Surrounded by the dense, pristine forests of the Oshima Peninsula, Shiriuchi offers an experience defined by profound silence and “Toji” (therapeutic) traditions. It is a destination for the historical romantic and the wellness purist—a place where you can soak in the same mineral-rich veins that once restored samurai, gold miners, and feudal lords of the Matsumae Clan.

Key Information

The Healing Waters: Two Worlds of Mineral Potency

The defining scientific feature of Shiriuchi Onsen is its diversity of independent spring sources. Within the single grounds of the historic inn, there are two distinct types of indoor baths. The Upper Bath (Kami-no-yu) is a bicarbonate-rich spring often called the “Beauty Bath” for its ability to emulsify skin oils and provide a silky, refreshed feeling. In contrast, the Lower Bath (Shimo-no-yu) is a ferruginous saline spring, heavily enriched with iron and salt. This water is murky and rust-toned, valued for its ability to improve blood circulation and aid in the recovery from physical trauma and surgery. The water gushes forth at a naturally high temperature of 75°C, and the inn is famous for its “petrified” tubs—the mineral deposits have accumulated over decades, creating thick, stone-like crusts around the pools that testify to the raw concentration of the earth’s medicine.

Top Recommended Ryokans & Stays

• Shiriuchi Onsen Inn Utopia Warakuen (Historic Heritage): The only place to stay in the immediate onsen area. It offers two buildings: the “Old Wing” with a nostalgic Showa-era travel atmosphere, and the “New Wing” featuring warm wood interiors and barrier-free facilities. It is a member of the Association of Secret Hot Springs in Japan.
• Kikonai Ekimae Hotels (Nearby Base): For those who prefer modern business-style amenities, staying near JR Kikonai Station allows easy day-trip access to Shiriuchi while being close to the Shinkansen line.
• Matsumae Onsen Ryokan (Coastal Alternative): Located about 40 minutes further west in the historic castle town, offering a different coastal mineral profile and panoramic views of the Tsugaru Strait.

Must-Visit Public Baths (Soto-yu)

Shiriuchi is a “single-inn” resort, meaning the Utopia Warakuen serves as the central “Soto-yu” for the community. For a modest fee, day visitors can access both the indoor mineral pools and the mixed-gender outdoor bath. A standout feature is the Private Outdoor Bath, which can be reserved for 30-minute intervals upon check-in. It is set against a mountain backdrop with no roof, allowing bathers to feel completely at one with the northern sky. For a more casual experience, the town center features the Komorebi Onsen, a modern municipal wellness center with diverse tubs and a rest area favored by local residents.

Walking Guide & Scenic Spots

Start with a visit to the Raikou Shrine, which boasts the longest history of any shrine in Hokkaido. It is the spiritual gateway to the region and holds records of the first settlers who arrived in 1205. Next, explore the Shiriuchi River Valley; the upper reaches are where gold panning once thrived, and the walking trails are spectacular during the autumn foliage peak in late October. For birdwatchers, the Shiriuchi Bird Watching Tower is essential; the area is a major migratory corridor for hawks and eagles. For a coastal view, drive 15 minutes to Shiriuchi Beach, a rugged expanse where you can see the mountains of Honshu across the Tsugaru Strait on a clear day.

Local Gastronomy & Souvenirs

The culinary pride of Shiriuchi is the “Sekkarei” Chives (Nira). These are considered the highest quality chives in Japan, known for their sweetness and thick leaves. Try the “Shiriuchi Nira Ramen” or chive gyoza at local diners. Being a coastal town, the Steam-cooked Oysters and Scallops are also legendary. For souvenirs, look for Shiriuchi Kelp and hand-carved woodwork. The nearby Roadside Station “Misogi-no-Sato Kikonai” also sells world-class Salted Bread and dairy products that represent the best of the southern Hokkaido region.

Cultural & Historical Context

The discovery of the onsen is linked to the samurai Araki Daigaku, who was sent by the Shogunate in 1205 to find gold. Legend says an injured heron guided him to the steaming springs. The town’s identity is most famously expressed in the Misogi Festival (Kanchu Misogi). Every January, four young men perform a purification ritual by carrying sacred statues into the freezing sea to pray for a bountiful harvest. This connection between the “Fire” of the springs and the “Ice” of the ocean defines the resilient spirit of Shiriuchi’s pioneers.

Practical Travel Tips

Transportation: The bus from Kikonai Station to “Yunosato Onsen Iriguchi” runs only a few times a day; always coordinate your Shinkansen arrival with the bus schedule. Mixed Bathing: The outdoor bath at Shiriuchi is mixed-gender (Konyoku), which is a rare traditional custom. While towels are allowed, it is polite to maintain a quiet and respectful demeanor. Cash: This is a rural area; the inn and local seafood stalls are strictly “Cash Only” for small purchases. Winter Travel: Heavy snow is common; if driving, ensure you are experienced with icy mountain roads.

2025-2026 Latest Updates

The **196th Kanchu Misogi Festival** is scheduled for **January 13–15, 2026**. This is the biggest event of the year, featuring winter fireworks and traditional food markets. Additionally, Utopia Warakuen has recently completed an upgrade to its **Wi-Fi infrastructure**, making it a viable destination for “Workations” where travelers can stay long-term while enjoying therapeutic baths.

Safety & Manners

In the onsen, do not splash water and always use the provided stools while washing. Shiriuchi’s iron water can stain light-colored clothing; ensure you rinse your skin thoroughly before dressing. Respect the historic nature of the buildings; some wings are 800 years old, so move carefully through the hallways. Finally, please take all trash back to your hotel to preserve the forest’s status as a sanctuary for rare birds and wildlife.