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Oimachi Onsen Kanagawa

Oiso, Kanagawa (Kanto), Japan
Oimachi Onsen Kanagawa
Location
Oiso, Kanagawa (Kanto), 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

Oiso, on the Sagami Bay coast of Kanagawa Prefecture between Hiratsuka and Odawara, is one of the most historically distinguished resort communities in the greater Tokyo region, its nineteenth-century villas having hosted five Japanese Prime Ministers including Ito Hirobumi and Yamagata Aritomo who retreated here to escape the capital's pressures. Oimachi Onsen Kanagawa draws on chloride-rich coastal thermal waters from the marine geological formations of the Sagami Bay coast, offering warming maritime baths in a resort community whose distinguished political and intellectual heritage, the pine-forested coastline, and the traditional Horaiji beach culture create an appealingly historic spa setting. The Oiso Prime Minister's Villa memorial park, the Yoshida Shigeru Memorial Museum honouring the postwar Prime Minister whose Oiso residence was the setting for many crucial postwar policy decisions, and the traditional Sagami Bay coastal scenery make Oiso a remarkably historically rich coastal thermal destination in western Kanagawa Prefecture.

Insider tip — Oimachi (Oiso area) sits on the Shonan coast of Sagami Bay, historically a seaside resort favoured by Meiji-era statesmen whose old villas dot the pine-studded shoreline. The coastal sodium-chloride spring draws from shallow marine-influenced layers and its saline warmth complements the briny sea air perfectly. Early-morning bathers often arrive direct from the beach for a restorative post-swim soak.
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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).