Hokkein Onsen Sansou is a hot spring inn located at an elevation of 1,303 meters in the northwest part of Bogatsuru Wetland on the mountainside of the Kuju Mountain Range, making it the highest-altitude hot spring in Kyushu. With a history dating back to 1324 when it was established as Hokkein Hakusuiji Temple of the Tendai Buddhist sect, and beginning operations as a mountain lodge in 1882, it boasts over 140 years of tradition as a historic hot spring mountain lodge.

This location sits at the center of the Kuju Mountain Range, surrounded by majestic peaks exceeding 1,700 meters including Mount Taisenzan, Mount Heijigatake, Mount Nakatake, and Mount Kuju. The Bogatsuru Wetland is Japan's largest intermediate wetland registered under the Ramsar Convention, featuring rare plant communities and opportunities to encounter wild rabbits and birds in this natural treasure trove.

The hot spring's distinctive feature is the spectacular view of the magnificent Kuju Mountain Range from the indoor bath windows. During the blooming season of Miyama-kirishima (mountain azaleas) from late May to June, guests can enjoy the beautiful pink flowers while soaking in the hot spring. In autumn, the mountains are painted with brilliant autumn colors, offering different natural beauty throughout the four seasons.

Known nationwide through the famous song "Bogatsuru Sanka," this beloved destination for mountaineers is considered one of Kyushu's premier hidden hot springs. Accessible only by a minimum 2-hour hike, it truly represents a special hot spring that can only be reached by those who make the journey on foot, earning it tremendous popularity. The rustic yet clean mountain lodge facility is registered with the Japan Association for Hidden Hot Springs and serves as a precious power spot where visitors can enjoy the tranquility and starlit skies impossible to experience in urban areas.