Hirugami Onsen

Hirugami Onsen is a traditional hot spring village in the Achi Village area of Nagano Prefecture's South Shinshu region, nestled in a deep valley of the Ina Mountains where the sulfurous thermal waters emerge from the volcanic and geothermally active foundations of the Japanese Alps. The onsen village, small and beautifully preserved in its traditional wooden architecture, is beloved by those who seek an authentic rural Japanese hot spring experience away from larger, more commercialized resort areas. The surrounding landscape of the Achi Village highlands — famous for its spectacular stargazing, recognized as one of Japan's finest dark sky locations — and the forested Ina Valley create an atmosphere of profound mountain stillness that deepens the restorative quality of the bathing experience. Hirugami Onsen is a hidden gem of the South Shinshu thermal tradition, offering genuine mountain onsen culture in one of Nagano's most scenically and astronomically extraordinary highland valleys.