Izu Onsen Village Complex

A major hot spring resort in Atami, Shizuoka Prefecture, closest to the greater Tokyo area. Developed as a therapeutic destination since the early Showa period, it became a major honeymoon destination post-war. Known for views overlooking Sagami Bay and unique iron-rich waters. Attracts around 4 million visitors annually.

A collective term for multiple hot spring resorts concentrated on the Izu Peninsula, Shizuoka Prefecture. Including Ito Onsen, Atami Onsen, Izu-Nagaoka Onsen, and Shuzenji Onsen, they blend seaside and mountain settings. Predominantly volcanic springs with diverse water qualities, thriving as healing destinations since the Edo period and remaining among Japan's premier tourist attractions.

Geothermal unity among multiple onsen areas on the Izu Peninsula, Shizuoka Prefecture. Shared volcanic geothermal source from the Izu eastern volcanic zone creates individualistic spring communities with varied mineral compositions and temperatures. Operating as a network rather than isolated sites, these springs integrate earth science tourism education with thermal therapy, developing as an advanced caldera landscape tourism model.

Collective geothermal region of multiple hot springs distributed across the caldera topography of Izu Peninsula, Shizuoka: Izuyama, Izunagaoka, Shuzenji, and others. Unified geological geothermal resources form independent onsen towns. From Edo period, recognized as a unified 'hot spring zone' through geographic knowledge systems. Connection with modern geology creates intersection of onsen and volcanology knowledge. Tourism consciousness emphasizes underground physical connections over surface network integration.

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.