The Oyunumagawa Natural Footbath is a remarkable natural attraction where the hot spring water from the high-temperature sulfur fountain of the Great Tomato flows downstream, gradually cooling to a comfortable temperature suitable for a footbath. This naturally formed footbath area provides a serene and authentic onsen experience amidst a beautiful forest landscape, making it a significant highlight for visitors to Noboribetsu.
Visitors consistently praise the relaxing and rejuvenating effect of soaking their feet in the warm, mineral-rich water, especially after a day of hiking through Hell Valley and around Oyunuma Pond. Many describe it as an "incredible experience" and a "must-visit" for its unique natural setting. The availability of free seating mats and the overall cleanliness of the area are frequently mentioned positive aspects. Reviewers often highlight the soothing warmth of the water, which is particularly enjoyable in colder weather or after a long walk. The natural sulfur smell is noted, but generally not considered off-putting, adding to the authentic hot spring atmosphere.
For a comfortable visit, it is highly recommended to bring your own small towel to dry your feet afterwards, as none are provided. While there are plastic/styrofoam sheets or cardboard squares to sit on, they can be limited or wet, so consider bringing a small, waterproof mat if you prefer. The water temperature is described as warm, not scalding hot, and visitors note that digging your feet into the black sand can reveal hotter spots. Plan to spend about 30 minutes to an hour here to fully enjoy the experience. The footbath is free to use, which is a significant bonus for many.
The footbath is accessible via several routes. Many visitors choose to walk from Jigokudani (Hell Valley), which is a scenic hike of about 20-40 minutes, though some sections involve stairs and can be muddy or icy in winter. Alternatively, you can drive to the Oyunuma visitor center parking lot (500 yen fee), from which the footbath is a relatively easy 200-meter walk. Some reviewers mention a free outdoor parking area near the entrance, but the main parking is paid. If coming by public transport, take a train to Muroran or Higashi-Muroran station, then a bus towards Noboribetsu Onsen. From the bus terminal, you can walk or take a taxi to the starting points of the trails. The trails are generally well-marked, but having a map from the information center is advisable.
A common complaint is that the area can get crowded, especially during peak times, which can diminish the peaceful experience. Some visitors also note that the benches can get wet. To mitigate this, consider visiting early in the morning or later in the afternoon. If you encounter crowds, try to find a less busy section of the stream or simply enjoy the surrounding nature while waiting for a spot. Adhering to basic onsen etiquette, even in an outdoor setting, helps maintain a pleasant environment for everyone.
