Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Effortless float
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Dense, salty water — you float without effort.
SodiumChloruresBrome
Kakegawa Onsen Shizuoka is a thermal spa in Kakegawa, a historic castle town in western Shizuoka Prefecture, Japan, celebrated as the home of the magnificent Kakegawa Castle — a rare wooden castle reconstruction — and the sprawling Kakegawa Kachoen bird park where visitors interact with hundreds of free-flying tropical birds. The naturally chloride-enriched hot spring waters provide a warming, mineral-rich bathing experience valued for improving circulation and relieving muscular and joint tension, offering a relaxing counterpart to the city's rich cultural and wildlife attractions. Combining authentic castle town heritage with the therapeutic pleasures of natural onsen bathing, Kakegawa provides a layered and deeply satisfying Japanese hot spring experience in one of Shizuoka's most historically interesting cities.
Insider tip — Kakegawa Onsen lies beneath the castle town of Kakegawa, where the historic keep overlooks surrounding tea fields and the Tokaido Shinkansen corridor. The sodium-chloride water is drawn from formations hundreds of metres below the agricultural plain and has a characteristic amber tint from dissolved organic minerals. Evening visits are rewarding as the illuminated castle walls are sometimes visible from outdoor bath areas on clear nights.