Gunma Travel Guide 2026 — Kusatsu Onsen, Tomioka Silk Mill & Mountains

Name: Gunma
Address: JP

Gunma Prefecture is Japan's hot spring capital, mountain playground, and silk heritage land — a landlocked prefecture north of Tokyo where volcanic peaks, therapeutic onsen, pristine highland forests, and the UNESCO World Heritage Tomioka Silk Mill define a destination unlike anywhere else in Japan.

Top spas

Curated picks for treatments and day spas.

Spa

Kusatsu Onsen Sainokawara Open-Air Bath

¥600 ($4.02) adults; ¥300 ($2.01) children1–2 hours

Spa

Takaragawa Onsen Osenkaku Outdoor Baths

¥1,500 ($10.05) day-use; accommodation from ¥22,000 ($147.40) per person with meals2–4 hours day-use; unlimited for overnight guests

Spa

Hoshi Onsen Chojukan Historic Bath House

¥1,500 ($10.05) day-use; accommodation from ¥15,000 ($100.50) per person with meals1–3 hours

Spa

Ikaho Onsen Ishidan-yu Public Bath

¥400 ($2.68) adults; ¥200 ($1.34) children30–60 minutes

Spa

Shima Onsen Kashiwaya Besso Private Onsen Suite

¥40,000–80,000 ($268–536) per person per night, 2 meals includedOvernight experience; unlimited bath access for guests

Wellness retreats

Multi-day immersive experiences.

Retreat

Oze Highland Wellness Retreat (Self-Guided)

1–3 nights¥7,000–11,000 ($46.90–73.70) per night at mountain hut including meals

Where: Oze National Park, Tone District

Wellness travel tips

Get the most from your wellness experience.

Tip

Book treatments in advance — popular slots fill up quickly during peak season.

Tip

Hydrate well before and after treatments, especially massages and saunas.

Tip

Communicate any allergies or skin sensitivities before treatments begin.