This is a quiet hot spring town rich in greenery that lies at the foothills of Mt. Sangane. The spring has an alkaline simple quality which makes it smooth on the skin, and it has beneficial effects on neuralgia and gastrointestinal pain. Ajisai Matsuri, a hydrangea festival, is held at Katahara Onsen Ajisai no Sato every June, and sees 50,000 hydrangeas in full bloom. You can enjoy the night light spectacle at your leisure, if you stay in one of the hot spring inns.