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.