Yokomuki Onsen (横向温泉)

Introduction: The Hidden Triple-Tiered Sanctuary of Mt. Minowa

Located at the base of Mt. Minowa in the Adatara range, Yokomuki Onsen (横向温泉) is a world of quietude and mystery. Its name, “Yokomuki” (Facing Sideways), is said to come from a legendary wounded deer that looked sideways toward the hidden spring to heal its wounds. This area is unique for its “Triple-Tier” structure, consisting of the Upper, Middle, and Lower springs, each with different properties. Most famous is the “Ashimoto-Yushutsu” (Under-the-floor gushing) spring at the Lower bath, where 100% natural thermal water rises directly from the bedrock beneath your feet. For the international traveler seeking a “True Hidden Spring” (Hikyō), Yokomuki provides a spiritual and physical sanctuary where time feels frozen in the Edo period. In 2025-2026, it is the ultimate destination for those who wish to experience the peak of Japanese balneology in total seclusion.

Key Information Table

The Healing Waters: Direct Communion with the Earth

Yokomuki’s waters are geologically prized for their minimal oxidation. Because the water at the lower tier (Shimo-no-yu) rises directly into the tub from the floor, it does not come into contact with the air until the moment you bathe in it.

The “Blood and Silk” Synergy

Scientifically, the springs are rich in Ferrous Iron (Fe2+) and Bicarbonate ions. The iron content makes these waters the definitive “Women’s Onsen,” traditionally used to treat anemia and improve circulation. The bicarbonate content provides a “Baking Soda” effect, softening the skin and making it feel like silk. The water is naturally lukewarm (approx. $36-39^circtext{C}$), allowing for long, meditative soaks that deeply activate the parasympathetic nervous system, resetting your body from the stress of modern travel.

Top Stays: The Three Tiers of Yokomuki

• 滝川屋旅館 (Takigawa-ya): (Upper Tier) An incredibly exclusive, single-group-per-day ryokan. It is the pinnacle of Japanese hospitality (Omotenashi). Reservations are hard to get but offer a legendary private experience.
• 森の旅亭 マウント磐梯 (Mount Bandai): (Middle Tier) A larger, more accessible forest lodge. It features a massive “Thousand-Person Bath” built from ancient cypress. Ideal for families and groups who want modern comfort and mountain views.
• 中の湯 (Naka-no-yu): (Middle Tier) A rustic, traditional inn focused on long-term “Toji” healing. Very popular with hiking enthusiasts.
• 下の方の湯 (Shimo-no-yu): (Lower Tier) The legendary “Bath of the Emperor.” This rustic, wooden bathhouse is where the water gushes from the floor. It is simple, authentic, and offers the purest mineral experience.

Walking Guide: The Old Gold Road

Yokomuki Nature Trail: A quiet forest path that connects the tiers. In autumn, the beech forest turns a brilliant gold, reflecting the “Golden Springs” of the region.

Mt. Minowa Hiking: For adventurous travelers, the trail from Yokomuki leads up to the peak of Mt. Minowa (1,728m), offering 360-degree views of the Aizu Basin and the Azuma mountains.

Local Gastronomy & Souvenirs

Iiwana (River Trout): Ryokans here specialize in salt-grilled trout caught from the pure mountain streams.
Fermented Aizu Side-dishes: Sample Nishin-no-Sanshuzuke (Herring pickled with Sichuan pepper leaves).
Vegan & Vegetarian Navigation:
The mountain lodges are experts in Sansai (Wild Vegetable) Cuisine. Request “Shojin-style” multi-course meals. Pro Tip: Enjoy the local Walnut Mochi—sweet pounded rice with a savory walnut paste. It is a calorie-dense, vegan-friendly snack for hikers. In nearby Aizu-Wakamatsu center, Vegemahi is the go-to for 100% plant-based Japanese sets.

Cultural & Historical Context

Yokomuki Onsen has been a favored retreat for the Japanese elite, including the Meiji Emperor and high-ranking samurai of the Aizu clan. The culture here is defined by its “Hikyō” (Hidden) status. For centuries, the village remained isolated during winter, preserving unique folklore about mountain spirits and the healing powers of the earth.[1, 2]

Practical Travel Tips

• Connectivity: Expect zero mobile signal at the lower tier baths. Higher tier ryokans provide Wi-Fi in common areas. This is a place for “Digital Detox.”
• Tattoo Policy: Mount Bandai is international-friendly and offers private rental baths. The lower tier Shimo-no-yu is very rustic and communal; if you have large tattoos, it is best to visit during early morning hours when it is quiet.
• Cash & Payments: This is a 100% cash-only area for day-trips and small purchases. There are no ATMs in Yokomuki.
• Winter Access: The road to Yokomuki (R459) is subject to heavy snow. 4WD is mandatory from Dec to March.

2025-2026 Latest Updates

For the 2026 season, Yokomuki is launching the “Starlight Meditation Program,” allowing guests to access the outdoor baths at night for guided astronomical observation in one of Japan’s zero-light-pollution zones. New E-bike rental stations in central Inawashiro now make it possible for fit cyclists to reach the middle tier of Yokomuki during the summer season.

Safety & Manners

Under-the-floor Etiquette: At the lower tier, the water is precious. Do not use soap or shampoo in the direct gushing baths to keep the source pure. Use the designated washing area first. Bears: This is deep forest territory; always carry a Bear Bell when walking between the tiers at dawn.