Kusamakura Onsen Tensui, located on Oten Hill in Tensui Town, Tamana City, is a hot spring facility set on the landscape that inspired Natsume Soseki's novel Kusamakura. Its highlight is the open-air bath with panoramic views from the Ariake Sea to the Shimabara Peninsula. After sweating in the far-infrared sauna, you can refresh in an excellent-quality cold plunge bath fed by Kumamoto's natural groundwater. The outdoor relaxation area is equipped with fully flat reclining chairs, and achieving totonou while gazing at the spectacular view is truly special.