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Akan-Mashū NP, Hokkaido
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At Sunayu, dig about 10 cm into the beach and warm spring water wells up for a homemade footbath. A 1962 geological report recorded 57.5°C in the sand near the central bathing area—serious volcanic heat beneath your toes!
When deep winter freezes much of Lake Kussharo, geothermal warmth keeps patches around Sunayu ice-free. Whooper swans migrating from Siberia gather there to rest, turning the hot-spring beach into a seasonal wildlife refuge.
A swan-site survey recorded vegetables being offered to birds at Sunayu. The Wild Bird Society of Japan says supplemental feeding around Lake Kussharo lets about 300 more whooper swans overwinter than natural food alone could support.
