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Lake Kussharo is the largest caldera in the whole of Japan, and the sixth largest lake. Being a caldera, the lake is actually part of the composite volcano of the Nakajima Island. Though the water is acidic, a few life forms has been discovered in the area, and the Rainbow trout, a kind of fish, has also been introduced into the lake. In 1951, the people discovered the Oncotympana maculaticollis, a rare form or cicada in the lake. Conservations has been done ever since.

Being a volcano, the lake shore is actually famous for its hot springs and naturally-heated sand beaches.

Photo by 663highland. Licensed under Creative Commons. (https://creativecommons.org/licenses/by-sa/3.0/deed.zh)

Tags: lake kussharo, largest caldera in japan, sixt largest lake in japan, nakajima island, acidic water, rainbow trout, rare cicada, conservation, hot spring, sand beaches