Tourism Spots · Hokkaido
Lake Mashū Brown Bear Incidents
Bear incident and sighting reports for Lake Mashū, compiled from official government sources, news outlets, and community submissions. View the interactive incident map and safety information before hiking or outdoor activities.
Lake Mashū’s latest bear report came on May 5, 2026 near Kannonko ike in Kiyosato, where a brown bear about 2 meters long was seen from about 50 meters away before it slipped behind a tree. Just two days earlier, on May 3, 2026, another bear of roughly the same size was spotted from a car near Kaminoko ike in Kiyosato, and another close call was reported there on April 29, 2026.
The most active ground has been around Kiyosato and Teshikaga, with repeated reports near Kaminoko ike, Kannonko ike, and Kawayu Junior High School. Activity has been strongest in July 2025 with 8 reports, then September 2025 with 6, August 2025 with 5, and March 2026 with 4. Lake Mashū has recorded 47 brown bear sightings overall.
Lake Mashū Bear Incident Map
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No incidents in this time range
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Frequently Asked Questions About Bears in Lake Mashū
How many bear incidents have been recorded in Lake Mashū?
Lake Mashū has recorded 47 bear incidents in total, with 4 reported in the last 30 days and 2 in the last 7 days. These reports are compiled from official government sources, news outlets, and community submissions, and can be viewed on the incident map.
When and where was the latest bear incident in Lake Mashū?
The most recent bear sighting in Lake Mashū was on May 4, 2026 in Kiyosato, Hokkaido, where 1 Brown Bear was reported. Detailed location and surrounding incidents are available on the incident map.
Where have bears appeared recently in Lake Mashū?
Recent bear sightings in Lake Mashū have been concentrated in Shibecha (22), Shibecha 字虹別原野 (8), Kiyosato (3). These areas have had multiple reports within the last 30 days.
Is bear activity increasing in Lake Mashū?
Activity is elevated. 2 of the 4 monthly incidents occurred in the last 7 days.
What type of bears are in Lake Mashū?
Lake Mashū is home to brown bears (Ussuri brown bear), which can weigh up to 500kg and are found only in Hokkaido. They are active from spring through autumn. Always carry bear bells and bear spray when hiking.