A source-fed spring with an overwhelming yield and an icy cold plunge bath
Hokkaido Naganuma Town
"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.
TypeNatural Hot Spring
A remarkable source with a yield of approximately 1150 liters per minute. This iodide-sodium-chloride strong saline spring coats the skin with salt and delivers outstanding heat retention. You can enjoy genuine, undiluted spring water with no added water.
Sauna TypeDry Sauna
Stove TypeInfrared Heater
Capacity20people
A spacious three-tier dry sauna. With a high temperature setting, powerful heat envelops your entire body and encourages a refreshing sweat. An open, comfortable space where even large groups can relax.
Water QualityNatural Water (Groundwater, Spring, etc.)
Capacity4people
An extremely cold cold plunge bath using water from the Chitose River system. The temperature changes with the seasons, and in winter it can deliver an especially intense cooling experience. The water quality is also excellent, and the refreshing feeling that follows the skin-stinging cold is exceptional.
Closed Days: None
〒069-1317 Hokkaido Yubari District, Naganuma Town, Higashi 6-sen Kita 4
Gender Access
Gender Separated
Curated by an expert who visits onsen and sauna facilities every day and has explored 300+ locations — only facilities confirmed to be truly exceptional are featured.
Learn more
A source-fed spring with an overwhelming yield and an icy cold plunge bath
Hokkaido Naganuma Town
"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.
TypeNatural Hot Spring
A remarkable source with a yield of approximately 1150 liters per minute. This iodide-sodium-chloride strong saline spring coats the skin with salt and delivers outstanding heat retention. You can enjoy genuine, undiluted spring water with no added water.
Sauna TypeDry Sauna
Stove TypeInfrared Heater
Capacity20people
A spacious three-tier dry sauna. With a high temperature setting, powerful heat envelops your entire body and encourages a refreshing sweat. An open, comfortable space where even large groups can relax.
Water QualityNatural Water (Groundwater, Spring, etc.)
Capacity4people
An extremely cold cold plunge bath using water from the Chitose River system. The temperature changes with the seasons, and in winter it can deliver an especially intense cooling experience. The water quality is also excellent, and the refreshing feeling that follows the skin-stinging cold is exceptional.
Closed Days: None
〒069-1317 Hokkaido Yubari District, Naganuma Town, Higashi 6-sen Kita 4
Gender Access
Gender Separated
Curated by an expert who visits onsen and sauna facilities every day and has explored 300+ locations — only facilities confirmed to be truly exceptional are featured.
Learn more