Shiroishi river's water source.

Kagamishimizu is known as Shiroishi River's water source. The origin of that name is from the Edo era, when the daimyo's were alternating, when a princess was walking along this ridge, she used the lake in place of a mirror to fix her hair. This got across just how beautiful, pure and clean the water of Shiroishi's river is. This river has been loved from long ago, with people gargling the water as good look.