About Naganuma Onsen
"Naganuma Onsen" is a natural hot spring with a source-fed flow, boasting one of the highest spring yields in Hokkaido. Its highly concentrated iodide-sodium-chloride strong saline spring has a very rich mineral composition, warming you from the core and keeping you warm long after you get out. The sauna area features two types: a spacious main sauna and a second sauna where smaller groups can relax in comfort. The cold plunge bath can become extremely cold, especially in winter, sometimes dropping to just above single-digit temperatures. Outdoor bathing in the open-air bath lets you enjoy the rich nature of Naganuma and the refreshing breeze while experiencing the blissful state of totonou.