The Genji firefly habitat in the Karukome area, which stretches 1.5km from Iwabuchi Bridge in the middle reaches of the Masubuchi River, was designated as a national natural monument on April 26, 1971.
After the river was designated as a cultural property by the town in 1971, the local people's efforts to protect the environment kept the stream clear, and a large number of Kawamushi(river insects), which serve as food for their. That's why it's a breeding ground.
*When viewing, please refrain from shining flashlights toward the river. (This will hinder the breeding of fireflies)