Dogo Onsen is a historic hot spring located in Matsuyama, Ehime Prefecture, Japan. It is one of the oldest onsen in the country, with a history dating back over 1,000 years. The main building, known as Dogo Onsen Honkan, features traditional wooden architecture and offers various bathing options, including indoor and outdoor baths. The onsen is famous for its soothing mineral waters, which are believed to have healing properties. Visitors can enjoy the serene atmosphere and beautiful surroundings, making it a popular destination for both locals and tourists seeking relaxation and wellness.