Located within Hakkoda Mountains, lies the famed Sukayu Onsen. Over 300 years old, with it’s timber building the oldest in the area; the onsen is known for its large public mixed bath onsen: Senjin Buro ( the bath of a thousand bathers). It was one of the first onsen along with Nikko Yumoto Onsen and Shima Onsen to be designated a National Recreational hotspring.

There are two other baths available, one for male and one for female, however the mixed bath is still the most popular.

Though we visited in the summer, a random fact I discovered is that Sukayu Onsen is apparently the snowiest inhabited place on Earth with an average yearly snowfall of 17.6m. Despite the intense snowfall, don’t let that deter you from visiting, as the roads to the Onsen are accessible all year round. I can only imagine how beautiful the area would look in winter.

The mixed bath area is approximately 250square meters. There are four sections within the public bath to explore.

The Netsunoyo bath lies at the front with the Shiburokubu bath at the back. Both of them are “divided” by simple sign posts declaring which is the male and female side (so you don’t actually weave in and out between the sexes). So hubby and I would sit side by side by the sign posts to have a chat.

As we were there in summer, the baths were distinctly less busy, enough that there were a few minutes where I managed to capture these photos with only us being there. However when there were others there. the demographic was entirely male and I was quite possibly the youngest person there.

To the side are the Reinoyu (cold bath) and Yutaki (waterfall bath), which are always nice for a refreshing change before heading back to dip into the two bigger baths. The Netsunoyu is known as the heat bath, named for how a long soak in its waters will warm the body right to the bones. It’s temperature is between 41 -42 degrees. The Shiburokubu bath’s temperature is around 43 degrees, and this slight increase in temperature gives it, it’s namesake “four to six tenths”, as that’s generally how long people can spend to soak in the hotter bath, four to six tenths the time spent in Netsunoyu.

Though we weren’t there at these times (we went after hiking Hakkoda); for two hours each day, 8:00 to 9:00(both AM & PM), the Senninburo is open to women only.

Sukayu onsen also features an onsite soba restaurant and omiyage shop which is perfect for day trippers, however you can also choose to stay at the onsen itself in one of it’s tatami rooms and enjoy a traditional Ryokan experience with breakfast and dinner. We decided to do it as a day trip, as we had already decided to stay at Nonohana Yakemaso to be slightly closer to Oirase Gorge & Towada ko.