Iai Valley (居合沢) is located in Namboku, Gunma. It is nice hiking course withe many beautiful waterfalls.

Tourist Info.
There is a parking and Restroom. Takes 30 min by walking from the parking.

Access
0. at Maebashi Station.
1. use JR Ryomo Line to Takasaki (15 min.)
2. use Joshin Line to Shimonita (1hr.)
3. use taxi to Sandannotaki.