Tosa Saga Onsen Kobushi-no-Sato is an onsen inn in Kuroshio Town, Hata-gun, Kochi Prefecture that also accepts day-trip bathing. The alkaline simple sulfur spring that wells up from underground has a pH of 9.4 and is cherished as a silky, skin-beautifying hot spring. The large public bath features a dry sauna warmed by gas far-infrared heaters and a comfortable cold plunge bath. Beside the open-air bath there is an outdoor relaxation area where you can refresh while breathing the natural air. The facility also offers a dining area and rest spaces.