Like much of Japan, Hokkaido is seismically active. Consequently, hot springs and volcanic vents can be found all across the island. Lake Kussharo, an inland lake in the western region of Hokkaido, is a caldera lake, a remnant of a long-ago erupted volcano. It is the largest of three caldera lakes that make up Akan National Park. And as with most geographic names in Hokkaido, the lake derives its name from the Ainu and the Ainu word “Kuccharo,” means “The place where a lake becomes a river.”

Its violent, seismic past is evident even today, with natural hot springs bubbling up along its shoreline, heating both the water and gravelly shores. It is here where the Whooper Swans gather to find refuge from Hokkaido’s brutally cold winters. The scientific name is from cygnus, the Latin for "swan".

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