Tamagawa Dam and Hosenko Lake (Hosenko) and Yoroihata Dam and Shusenko Lake (Shusenko), which stretch along Route 341.
Submerged forests can be seen from May to mid-June when the snow melts.
They appear on the bright lapis lazuli-colored surface of the lake for about a month when the water level is lowered by releasing water from the dam in preparation for the summer flood season.
The mysterious view of the trees can be enjoyed.