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Numazu Onsen Shizuoka

Numazu, Shizuoka (Chubu), Japan
Numazu Onsen Shizuoka
Location
Numazu, Shizuoka (Chubu), Japan
Water type
sodium chloride
Temperature
40 °C
pH
7.3

Water profile

Thermicity
Sedative
40 °C
LowHigh

Relaxing — deep, immediate muscle release.

Mineralisation
Restorative
LowHigh

Loaded with major ions — the essential minerals (Ca, Mg).

Buoyancy
Effortless float
LowHigh

Dense, salty water — you float without effort.

SodiumChloruresBrome

Numazu, a port city at the mouth of the Kano River at the northern tip of Suruga Bay in Shizuoka Prefecture, is celebrated for its spectacular sunrise views of Mount Fuji reflected in the bay and for its role as Japan's most important landing port for deep-water seafood of the Suruga Trough, the deepest bay in the country. Numazu Onsen Shizuoka taps chloride-rich coastal thermal waters from the marine geological formations of Suruga Bay's edge, offering soothing maritime baths in a city whose fish market is famous for giant isopods, angler fish, and rare Pacific deep-sea species. The Numazu Deep Sea Aquarium housing live specimens from the 2,500-metre Suruga Trough, the historic Mishima Taisha shrine nearby, and the stunning Fuji coastal panorama from the Senbonhama pine forest make Numazu a uniquely compelling coastal spa destination in Shizuoka.

Insider tip — Numazu Onsen overlooks Suruga Bay, the deepest bay in Japan, with panoramic views toward the Izu Peninsula on clear days. The sodium-chloride waters at 40°C have a noticeably buoyant, oceanic quality attributed to the deep marine sediment layers from which they are drawn. The nearby Numazu Port fish market means breakfast sashimi after an early-morning soak is practically a local ritual.
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Frequently asked questions

How hot is the water?
The water runs quite hot here, around 40 °C — a sedative water that brings immediate muscle release.
What type of water is found here?
This spot features sodium chloride water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année (idéal automne-hiver).