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Fuji-Hakone-Izu NP, Tokyo
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Local legend says an injured sea lion soaked here and healed; its wounded foot is linked to the name Ashitsuki. The clear spring also earned the nickname “Surgery Bath” for its traditional association with cuts and scrapes.
Ashitsuki is the only spring on Shikinejima described as bubbling up clear and colorless. It emerges among the island’s rocky shores, making this natural pool look quite different from the island’s other well-known hot springs.
The source is about 50°C, but seawater mixes into Ashitsuki’s shore pools, so their temperatures shift with the tide. Different pools can feel different, too—finding a comfortable spot is part of this very natural hot-spring experience.
A Shikinejima history source cites an account from around 1800 praising the island’s hot spring for skin healing. That old written reference helps explain Ashitsuki’s long-standing “Surgery Bath” nickname—though it records a traditional belief, not modern medical advice.
Sometimes, small fish left behind in Ashitsuki’s pools are boiled as the tide retreats. The Shikinejima Tourism Association shares this surprising little detail—a reminder that these pools are natural hot springs, not temperature-controlled baths.
