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Asamushi Onsen Aomori Bay

Asamushi, Aomori City, Aomori Prefecture, Japan
Asamushi Onsen Aomori Bay
Location
Asamushi, Aomori City, Aomori Prefecture, Japan
Water type
sodium chloride
Temperature
41 °C
pH
7.3

Water profile

Thermicity
Sedative
41 °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

Asamushi Onsen sits on the Aomori Bay shore at the northern tip of Honshu, where chloride-rich coastal thermal waters in a historic resort town offer panoramic views across the bay toward the Tsugaru Strait and Hokkaido's mountains. The onsen town has been a popular resort since the late Edo period, and the marine-facing outdoor baths heated by sodium chloride springs are traditionally associated with skin comfort, relaxation, and a sense of restful vitality within a long thermal tradition. Aomori's rich cultural identity — centered on the spectacular Nebuta Festival, one of Japan's greatest summer matsuri featuring enormous illuminated lantern floats — surrounds this coastal onsen with an energy of local tradition and matsuri culture unique to the Tohoku region.

Insider tip — Asamushi Onsen stretches along the pine-fringed shore of Mutsu Bay where sodium-chloride spring water at 41°C is channelled into wooden ryokan built over the water's edge. The briny waters are known locally for warming the body for hours after bathing — particularly valued during Tohoku's bitter winters. Arrive by the Aomori scenic coastal railway and soak before taking the evening ferry toward Hokkaido for a memorable Tohoku send-off.
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Frequently asked questions

How hot is the water?
The water runs quite hot here, around 41 °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).