Sainokawara Open-Air Bath - A Tattoo-Friendly Hot Spring in Kusatsu Onsen, Gunma

Nestled in the verdant highlands of Gunma Prefecture, Sainokawara Open-Air Bath (西の河原露天風呂) stands as a crown jewel within Kusatsu Onsen, one of Japan's most celebrated hot spring destinations. This magnificent 500m² bathing paradise invites you to soak in milky-blue healing waters while surrounded by the breathtaking beauty of seasonal nature—from snow-capped mountains in winter to vibrant autumn foliage.

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Unlike many traditional bathing facilities in Japan, Sainokawara welcomes tattooed visitors with open arms, making it a perfect destination for international travelers seeking an authentic onsen experience without worry. Here, the therapeutic acidic waters—once praised by samurai shogun Minamoto no Yoritomo and Meiji-era German physician Dr. Erwin von Bälz—continue their centuries-old tradition of healing and rejuvenation for all who visit.

Fully Tattoo-Friendly: Sainokawara Open-Air Bath explicitly welcomes guests with tattoos to enjoy their bathing facilities without restrictions. No covering required for tattoos of any size during regular hours or Friday mixed-bathing sessions.

• Breathtaking Natural Setting: Immerse yourself in one of Japan's largest outdoor hot springs while surrounded by forest scenery that transforms magnificently with each season
• Therapeutic Healing Waters: Experience the renowned acidic sulfate-chloride springs (pH 2.1) that naturally sterilize the water and are celebrated for relieving joint pain, skin conditions, and fatigue
• Historic Significance: Bathe in the same waters that have attracted Japanese nobility and international visitors for centuries, including legendary shogun Minamoto no Yoritomo
• Mixed Bathing Opportunity: Enjoy the unique cultural experience of konyoku (mixed bathing) in swimwear during special Friday evening sessions—perfect for couples and families
• Complete Tattoo Freedom: Feel fully welcomed as a tattooed traveler in a traditional onsen setting without worry of judgment or restriction

Stepping into Sainokawara's expansive outdoor baths feels like entering another world—one where time slows and nature's embrace is complete. The distinctively milky-blue waters, heated naturally to 45-48°C by volcanic activity, carry a slight sulfuric aroma that signals their therapeutic potency. Unlike many onsen, you'll notice the absence of conventional showers; instead, you'll join locals in the traditional practice of rinsing with wooden ladles before immersion.

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The highly acidic waters (pH 2.1) create a naturally antibacterial environment while delivering potent mineral benefits directly to your skin. Regular bathers report relief from chronic skin conditions, improved circulation, and remarkable recovery from fatigue. As you soak beneath open skies—perhaps starring at stars on winter nights or watching steam rise through autumn leaves—you'll understand why Kusatsu's waters have been revered for their healing properties since ancient times.

• Adults: ¥600-800 (varies seasonally, higher in winter)
• Children (ages 3-12): ¥300-400
• Towel rental: ¥320
• Locker use: ¥100 (refundable)

No advance reservations are required for Sainokawara Open-Air Bath—simply arrive during operating hours to purchase your entry ticket. The facility can become busy during weekends and holidays, so weekday mornings offer the most peaceful experience.

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🌐 Website: Sainokawara Open-Air Bath

📞 Phone: +81-279-88-6167

📍 Address: 521-3 Kusatsu, Agatsuma District, Gunma Prefecture 377-1711, Japan

• Monday: 9:00 – 20:00
• Tuesday: 9:00 – 20:00
• Wednesday: 9:00 – 20:00
• Thursday: 9:00 – 20:00
• Friday: 9:00 – 20:00
• Saturday: 9:00 – 20:00
• Sunday: 9:00 – 20:00