Shimofuro Onsen Kaikyo no Yu

Kaikyo no Yu (海峡の湯) opened in 2020 to replace the two older communal baths that had long served Shimofuro, drawing water from both of those original sources: Oyu (大湯) and Shinyu (新湯). The three indoor baths split across the two springs. Two are milky white with a faint sulfur smell; the third runs nearly clear. All water is free-flowing kakenagashi, and the baths run hot enough that bathers often come out flushed red. There is no outdoor bath, but the bath hall has a window looking out over the Tsugaru Strait, with Hokkaido visible on clear days. A sauna built from Aomori hiba cedar sits alongside a cold plunge. Fishermen coming in from the morning catch are a common sight.