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This 197 km route runs from Parthenon Tama to Tsumagoi, passing through Tokyo, Gunma, Nagano, and Saitama. In the past 30 days, 63 bear sightings were reported within 5 km of the route. The past 7 days account for 12 of them. The latest sighting was reported 3 days ago near Karuizawa 大字長倉, Nagano.
This is an active bear corridor. Drive through with full caution, but rerouting is the safer choice.
4 places within 1 km of your route, passing through Tokyo, Gunma, Nagano, Saitama.
Size: Adult
Karuizawa 大字長倉, Nagano
Size: adult
Karuizawa 軽井沢, Nagano
Size: adult
Karuizawa 中軽井沢, Nagano
Size: Adult
Karuizawa, Nagano
Size: Unknown
Karuizawa 中軽井沢, Nagano
Size: adult (fully grown)
Karuizawa 軽井沢, Nagano
Fukaya, Saitama
Tsumagoi Ashiuda, Gunma
Tsumagoi, Gunma
Size: Unknown
Karuizawa 軽井沢東, Nagano
Two bear-like animals were reportedly sighted in Musashino, Fukaya City.
Fukaya 緑台, Saitama
Tsumagoi Ashiuda, Gunma
A bear was sighted in Osasa, Tsumagoi Village, Gunma.
Tsumagoi Ozasa, Gunma
Size: Adult
Karuizawa 軽井沢, Nagano
An adult bear and a cub were crossing the road from north to south.
Tsumagoi Kanbara, Gunma
Location: 36.36815° N, 138.59869° E We encountered 1 adult female bear with 2 cubs. The adult bear made a bluff charge toward us (stopped around 5 meters away) while the cubs ran up the hill. They then moved away together.
Karuizawa 中軽井沢, Nagano
Size: adult with cubs
Karuizawa 大字長倉, Nagano
Size: Adult
Karuizawa 軽井沢, Nagano
Annaka 上後閑, Gunma
A bear was sighted in Kamigokan, Annaka City, Gunma Prefecture, on 2026-08-01.
Annaka 上後閑, Gunma
Size: Adult
Karuizawa 中軽井沢, Nagano
Around 1:00 on July 31, a bear was sighted in Niibori, Matsuida-machi, Annaka City.
Annaka 松井田町新堀, Gunma
Annaka 松井田町新堀, Gunma
Size: Adult (fully grown)
Karuizawa, Nagano
Size: Adult (fully grown)
Karuizawa 中軽井沢, Nagano
Tsumagoi, Gunma
Annaka 松井田町二軒在家, Gunma
A bear was sighted in Matsuidamachi Matsuida, Annaka City, Gunma Prefecture, around 12:45 on July 30.
Annaka 松井田町松井田, Gunma
Annaka 松井田町人見, Gunma
A juvenile bear about 1 meter long was spotted along Prefectural Route 43 (Momiji Line) of the Karuizawa–Shimonita route. The mother bear could not be found, but is believed to be hiding nearby.
Shimonita, Gunma
Around 1:00 PM on 2026-07-28, one bear was sighted in Karuizawa, Karuizawa Town, Nagano Prefecture.
Karuizawa 大字軽井沢, Nagano
A bear was sighted in Goryo, Matsuidamachi, Annaka City around 8:00 on 2026-07-27.
Annaka, Gunma
Annaka, Gunma
Size: adult
Karuizawa, Nagano
Around 8:20 PM on July 26, a bear-like animal was sighted in Hirai, Hinode Town, Tokyo.
Tokyo Hirai, Tokyo
Annaka 松井田町土塩, Gunma
Size: juvenile
Karuizawa 大字長倉, Nagano
Around 8:20 AM on 2026-07-24, one bear was sighted in Hatachi, Karuizawa Town, Nagano Prefecture.
Karuizawa 大字発地, Nagano
Size: juvenile
Karuizawa, Nagano
Size: Adult
Karuizawa 大字発地, Nagano
Around 8:20 on 2026-07-24, a bear was sighted in Nagakura, Karuizawa Town, Nagano Prefecture.
Karuizawa 中軽井沢, Nagano
Size: Adult
Karuizawa 大字長倉, Nagano
Naganohara Kitakaruizawa, Gunma
Akiruno Sannai, Tokyo
A bear was sighted in Mogusa, Karuizawa Town, Nagano Prefecture, around 7:15 a.m. on July 21.
Karuizawa 大字茂沢, Nagano
Size: Adult
Karuizawa 大字茂沢, Nagano
Size: Unknown
Karuizawa 大字長倉, Nagano
A bear was sighted in Karuizawa, Karuizawa Town, Nagano.
Karuizawa 大字軽井沢, Nagano
Annaka 松井田町行田, Gunma
One bear was seen moving in Matsuida-cho Gyoda, Annaka City, Gunma.
Annaka 松井田町行田, Gunma
Size: cub (young bear)
Karuizawa 中軽井沢, Nagano
Size: Juvenile
Karuizawa 大字軽井沢, Nagano
Size: cub (young animal)
Karuizawa 大字軽井沢, Nagano
Size: Adult
Karuizawa 大字軽井沢, Nagano
Size: juvenile
Karuizawa 大字長倉, Nagano
Naganohara, Gunma
Size: adult (fully grown)
Karuizawa, Nagano
Tsumagoi, Gunma
Size: adult and cub
Karuizawa, Nagano
Size: juvenile
Karuizawa 大字軽井沢, Nagano
Tsumagoi Omae, Gunma
Naganohara Okuwa, Gunma
It looked like a large dog crossed the area, but there was no owner, and I realized it was a wild animal. It was not a boar, deer, or badger. Judging from the size, gait, and silhouette, I think it may have been a young Asiatic black bear (Ursus thibetanus), so I am reporting it. Also, while walking nearby I found a black, glossy, flattened droppings. After examining it, I believe it is likely from a bear.
Karuizawa 大字軽井沢, Nagano
Peak activity at 8:00 with 4 incidents
Ursus thibetanus japonicus
Safety picks and trail essentials, top-rated on Amazon and Rakuten.
For mountain rescue, call 110 (police). They will coordinate with local rescue teams.
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In the past 30 days, 63 bear sightings were reported within 5 km of the route. The past 7 days account for 12 of them.
The latest sighting was reported 3 days ago near Karuizawa 大字長倉, Nagano.
Recent sightings on this route peak around 8:00. Bears are generally most active at dawn and dusk.
This 197 km route runs from Parthenon Tama to Tsumagoi, passing through Tokyo, Gunma, Nagano, and Saitama. In the past 30 days, 63 bear sightings were reported within 5 km of the route. The past 7 days account for 12 of them. The latest sighting was reported 3 days ago near Karuizawa 大字長倉, Nagano. This is an active bear corridor. Drive through with full caution, but rerouting is the safer choice.
