This is a valley formed by the Sugoroku River that flows from Mt. Sugorokudake of the Northern Japan Alps.
The beautiful emerald green water of the Sugoroku River is so clear that you can see right down to the riverbed.
In summer it becomes a lively spot as families bring their children to play in the river, and in autumn the whole of Sugoroku Valley is covered in the brilliant colors of the autumn leaves.