Aso Onsen Volcanic Geothermal Energy Utilization

Thermal spring utilization of volcanic geothermal energy in the Aso region, Kumamoto Prefecture. A well-developed hot spring supply system using direct geothermal heat from Mount Aso's volcanic activity supports numerous onsen areas. As a tourism destination with volcanological significance, it integrates educational earth science value with thermal therapy. It realizes unique tourism model combining volcanic landscape tours with hot spring experiences.

A mountain hot spring resort in Minami-Oguni, Kumamoto Prefecture, with approximately 30 traditional inns lining a charming street. The 'yumeguri' practice of visiting multiple inns with different spring qualities is popular, attracting approximately 500,000 visitors annually. Known as a hybrid resort preserving Edo-period atmosphere while offering modern services, it represents Japan's hot spring culture.

A hot spring resort in Aso, Kumamoto Prefecture, characterized by abundant geothermal resources from the massive caldera and volcanic activity. Diverse water types emerge—acidic, bicarbonate-rich, and mineral-containing springs. Bathing within volcanic landscape creates unique sensations of Earth's vitality. Local medical research institutions continue scientific validation of therapeutic effects.

A hot spring city boasting the highest volume of spring water in Japan. Known for its 'Beppu Hatto' — eight distinct onsen areas — and 'Jigoku Meguri' (Hell Tour), the city has roughly 2,300 individual springs. Diverse tourism experiences leverage these thermal resources in creative ways.

One of Japan's 'Three Great Hot Springs' in Gunma Prefecture. Roughly 4,000 liters of hot spring water gush per minute from the Yubatake (hot water field), and unique bathing customs include yumomi (water stirring) shows. It consistently ranks among Japan's most popular onsen destinations.

Hokkaido's premier hot spring resort, nicknamed the 'Department Store of Onsen' for its nine different spring types. The Jigokudani (Hell Valley) with rising steam and sulfur scents conveys nature's overwhelming power. Welcoming about three million visitors annually, it excels at hosting international tourists.