This is the small lake, which is located on the West Coast of Lake Chuzenji. It used to be a part of Lake Chuzenji. The Lake Sainoko is a good spot, which isn't known to the public very much. It is the quiet environment where only a natural sound can be heard. For example, sound of a wind, chirping of a bird and you will hear the cry of a deer if you were concentrated on the natural sound. It is not rare that hikers meet deer on the hiking course. Marshland plants are flourished in the forest. Size of the lake will be changed by water level. A part of the forest sometimes is flooded.

You can go there by hybrid bus, and walk for 15 minutes.