Lake Kussharo, Caldera lake in Akan National Park, Japan
Kussharo is a broad caldera lake in eastern Hokkaido, sitting at 121 meters elevation and recognized as Japan's largest by surface area. Mountains surround the water while its shores spread across several access points, each offering different views and entry to the surrounding forests.
The lake formed through intense volcanic eruptions that created a large caldera gradually filling with water over time. Later eruptions shaped the smaller islands within the basin and altered its appearance through the centuries.
The name Kussharo comes from the Ainu language and marks the bond between indigenous communities and this natural basin. Today visitors notice this heritage through place names and local interpretations along the shore.
The shoreline offers several outdoor hot springs where visitors can relax directly by the water. Sunayu Beach allows digging into the sand to find warm spring water beneath the surface.
During winter the Wakoto Peninsula shows geological formations where ice contracts and expands, creating visible ridges across the frozen surface. These ice ribs form through temperature shifts and change how the frozen lake appears.
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