Japan: Mayfly Swarm Blankets Bridges Over Kiso River, Creates Slippery Roads

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Japan: Mayfly Swarm Blankets Bridges Over Kiso River, Creates Slippery Roads

A massive swarm of mayflies has swept over bridges spanning the Kiso River between Aichi and Gifu prefectures, a recurring September phenomenon in the area. Footage shows the insects, drawn to lights, obscuring drivers' visibility, while their carcasses have piled up on the road surface, creating slippery conditions that motorcyclists have called dangerous. Experts say the swarm could persist for about a week and are urging drivers to slow down and keep windows closed.

  • Product Code
  • ILEA005092866
  • Registered date
  • 2026/9/08 22:11:48
  • Credit
  • @9Usw13b6acqiTvn via Spectee
  • Media source
  • @9Usw13b6acqiTvn via Spectee
  • Media size
  • 1920 × 1080 pixel
  • Deployment size
  • 141.46(MB)*
  • Special instruction
  • Aichi Prefecture and Hashima, NOTE: No audio Video Location: Nobi Bridge between Ichinomiya, 2026 at about 20:00h, Gifu Prefecture, Japan Video Recording Date/Time: September 7

*File size when opened in Photoshop, etc.

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