Kua Onsen Yashima is a retro sento in Takamatsu City. The sauna room follows a Showa-era strong style with a powerful exposed far-infrared stove that pushes temperatures above 110℃. Right outside the sauna is a bone-chilling cold plunge bath chilled to 15–17℃. An outdoor cooling/rest area is also available, creating a flow and level of heat that sauna enthusiasts will love.