Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Effortless float
LowHigh
Dense, salty water — you float without effort.
SodiumChloruresBrome
Shimukappu Onsen Tomamu, in Shimukappu village of Hokkaido's central highlands, is set within the Hoshino Tomamu resort complex — one of Japan's most architecturally striking ski and wellness destinations, where the famous Unkai Terrace gondola carries guests above the tree line at dawn to witness a sea of clouds filling the valleys below as the Hidaka mountains emerge from the mist, creating one of Hokkaido's most magical visual spectacles. The chloride thermal waters of the Tomamu complex provide spa and onsen bathing in a four-season alpine resort environment at 900 metres altitude, complementing world-class skiing in winter and extraordinary cloud-sea and wildflower seasons of summer and autumn. Tomamu's sophisticated resort infrastructure — including an indoor tropical beach wave pool operating year-round in one of Hokkaido's coldest mountain settings — represents the most ambitious fusion of thermal wellness and luxury resort design in Hokkaido's holiday landscape.
Insider tip — Shimukappu Onsen lies in the shadow of the Hoshino Tomamu resort towers in central Hokkaido's alpine wilderness, where winter powder snow is among the deepest in Japan. The sodium-chloride springs warm skiers and snowboarders after long days on the slopes, and the outdoor baths steam dramatically against the frozen forest. The area sits on an Ainu heartland whose topographic names—Shimukappu meaning 'headwaters of the river' in Ainu—reveal a deep indigenous geography. Off-season visits in summer offer excellent hiking into the Hidaka mountain range.