Karamatsu no Yu, now closed, was a thermal bathhouse in the Akan District of Hokkaido, Japan, fed by thermal water. It offered an indoor bath, an outdoor bath (rotenburo) and a sauna.
Insider tip — Karamatsu no Yu ('Larch Hot Water') — a closed onsen facility in the Akan district of eastern Hokkaido near Kushiro. Listed in OSM as 'Closed'. The Akan area (Lake Akan, Lake Mashu) is rich in geothermal activity; this specific facility has ceased operations.