Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Effortless float
LowHigh
Dense, salty water — you float without effort.
SodiumChloruresBrome
Hiratsuka Onsen is a straightforward and welcoming hot spring facility in Hiratsuka city on the Shonan coast of Kanagawa Prefecture, a city known throughout Japan for its spectacular annual Tanabata Festival — one of the country's largest and most colorful star festival celebrations held each July. The chloride-rich mineral waters provide effective body warming and skin-nourishing benefits, offering a restorative experience in a city that combines a lively urban character with proximity to the beaches and cycling routes of the Shonan coastline. The onsen serves as a comfortable base for exploring the wider Shonan region's coastal attractions and the many historical sites of the southern Kanto Plain.
Insider tip — Hiratsuka Onsen lies in the flat coastal city famous for its Tanabata Festival, one of Japan's largest summer celebrations. The sodium-chloride thermal water rises from sedimentary strata beneath the Sagami coastal plain, delivering saline mineral baths that warm the body even in the humid subtropical summers. The facility caters largely to local regulars, offering a genuine sento neighborhood atmosphere.