This place is located along the Hosenji River. This hot spring has a long history, and it is said that when Sugawara Michizane was demoted to Dazaifu in the first year of the Engi period (901), he discovered this hot spring when he escaped an assassin and hid, and then opened the hot spring. The place became the current facility, in the third year of Ansei (1856), when the village chief, Sugawara Motonori, started to open the hot spring for the locals and built the stone bathtub and hot spring hut, which are still used until now. As its name suggests, this spring's hot water flows out from the bottom of the river, and the bathhouse was built on top of the source in a way that the source itself becomes a bathtub. It is a rare hot spring that has its source flowing from the base of the tub."