Lake Kussharo as seen from Sunayu. Lake Kussharo's caldera volcano started forming over one million years ago. The caldera lake formed over 40,000 years ago.

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Filename:	ku302-RIMG0186.jpg
Album name:	philbert / Lake Kussharo 屈斜路湖
Keywords:	hokkaido / teshikaga / lake / kussharo
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Date added:	Apr 04, 2022
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Part of the caldera lake was filled in by Mashu volcano eruptions, making Kussharo lose its round shape and become bean-shaped.