Sainokawara Rotenburo

807. Sainokawara, Kusatsu Onsen, Gunma ★★★ The main bath in Kusatsu Onsen. Price is 800. Opening hours are listed as 09:00 to 20:00 (December to March) and 07:00 to 20:00 (April to November). Mixed bathing with clothes on in the men's bath on Fridays from 17:30 to 20:00. Included in the Kusatsu tegata postcard. A huge outdoor bath made of stone. It is fenced off, but there are mountains and hills all around, so the natural view is of the trees. The size, combined with the view, is very impressive. The water is clear, and the temperature is between 41.5 and 45 depending on the measurement point. A top onsen. Definitely worth visiting. It is the kind of onsen where, for a great onsen experience, you can just come to Kusatsu, stay at any basic lodging, and do higaeri only at Sainokawara. 15.01.2026

Meanwhile — Kusatsu Sai-no-Kawara. One of the must-visit higaeri onsens in Kusatsu. This is an enormous pool of onsen water. Sulfur, acidity. Because of its size, you get a temperature gradient from "I'm now a boiled lobster" to "I could sit here all year." You need to walk a bit from the center to get there, but it's absolutely worth it. On Fridays there's mixed bathing (konyoku) on the men's side.