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.
Gunma is one of Japan's safest prefectures. Violent crime is extremely rare. The primary risks for travellers are natural hazards: volcanic activity near Kusatsu's Mt. Shirane, winter mountain road conditions, river sports hazards near Minakami, and wild animal encounters on hiking trails.
Current safety advisory
Very Safe
Essential safety tips
Practical advice that applies everywhere.
Keep copies of important documents (passport, insurance) in separate locations.
Stay aware of your surroundings, especially in crowded areas and tourist hotspots.
Use registered taxis or rideshare apps. Avoid unmarked vehicles offering rides.
Trust your instincts — if a situation feels wrong, remove yourself from it.
Common scams to avoid
Recognise and sidestep tourist-targeted scams.
Health considerations
Staying healthy on your trip.
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- Water safety
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- Tap water is safe to drink throughout Gunma. Onsen water is mineral-rich and acidic (especially Kusatsu); do not drink it unless a sign specifically indicates it is safe.
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- Pharmacies
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- Matsumoto Kiyoshi and Tsuruha Drug pharmacies in Takasaki and Maebashi carry basic medications. Staff may not speak English — bring a translation app. Prescription medicines from overseas may require Japanese prescriptions.
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- Insect hazards
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- Japanese giant hornets (osuzumebachi) are present in mountain forests May–October. Do not approach nests. In case of sting: seek emergency care immediately. Tick-borne disease (Japanese spotted fever) risk is present — use insect repellent and check for ticks after hikes in forest areas.
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- Heat and altitude
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- Kusatsu Onsen sits at 1,200m and is cooler than Tokyo by 5–8°C. Mt. Akagi summit (1,828m) can experience sudden weather changes. Carry sun protection — UV is stronger at altitude.
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- Onsen safety
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- Kusatsu's water is extremely acidic (pH 2.0) — limit initial soaks to 3 minutes and build up gradually. Persons with heart conditions, high blood pressure, or open wounds should consult a doctor before bathing. Do not soak alone in private or remote outdoor onsen.
Safety for specific travellers
Tailored advice for different groups.
Emergency contacts
Numbers to know before you go.
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