Lake Sai, Landslide-dammed lake in Fujikawaguchiko, Japan.
Lake Sai is a landslide-dammed lake in the Fujikawaguchiko area and part of the Fuji Five Lakes system. The water surface sits at 900 meters elevation and is surrounded by steep forested slopes.
The lake formed in 864 when a volcanic eruption of Mount Fuji created lava flows that separated one large water body into three distinct lakes. This geological event shaped the landscape that exists today.
The Saiko Iyashi no Sato craft village features traditional farmhouses with thatched roofs where artisans still practice Japanese handicrafts and noodle making by hand. You can watch these craftspeople at work and understand how these skills remain part of local life today.
The lake is accessible by regular bus services from Kawaguchiko Station and offers hiking trails, camping spots, and fishing opportunities. The area also attracts visitors in winter for seasonal activities suited to the snowy conditions.
Underground waterways connect this lake to two neighboring lakes while maintaining identical water levels across all three at 900 meters elevation. This natural hydraulic system reveals a remarkable phenomenon of how water remains balanced across separate bodies.
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