Izu Caldera Geothermal Onsen Network

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.

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 name for numerous hot spring resorts scattered across the Izu Peninsula in Shizuoka Prefecture. Over ten onsen including Atagawa, Kawazu, Shuzenji, and Nakaa-Izu offer varying mineral compositions. Volcanic activity produces diverse waters, and has long been beloved by literati and artists throughout Japanese history.

A hot spring resort in Atami, Shizuoka Prefecture, known since the Edo period and developed as a modern destination after Meiji-era beach construction. During Japan's high-growth period, it became a premier group-tour destination with numerous inns and theme parks. It maintains its resort status while undergoing historical structure revaluation and urban renewal initiatives.

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 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.