Lake Toya Caldera, Nakajima Island & Mount Usu Active Volcano

Category: Volcanic Caldera Lake & UNESCO Global Geopark | Location: Toyako Onsen, Toyako-cho, Abuta-gun, Hokkaido 049-5721

Nestled within Shikotsu-Toya National Park in southwestern Hokkaido, Lake Toya (*Toyako*) was designated as Japan’s first UNESCO Global Geopark in recognition of its dynamic volcanic landscapes and rich coexistence with human settlements. Formed roughly 110,000 years ago by colossal volcanic collapses, this nearly circular caldera lake spans 11 kilometers in diameter with a 43-kilometer shoreline. Warmed by geothermal heat radiating from deep magma chambers, Lake Toya is celebrated as Japan’s northernmost ice-free lake (*futo-ko*), retaining its crystalline deep-blue waters throughout freezing subarctic winters. Floating serenely at the lake’s center is a cluster of forested volcanic domes known as the Nakajima Islands. Visitors can board the fairytale medieval castle-style cruise ship *Espoir* from Toyako Onsen town to disembark on the largest island, wandering through primeval spruce and cedar groves inhabited by wild Hokkaido sika deer (*Ezo-shika*) and touring the Lake Toya Forest Museum. On the southern caldera rim, the Usuzan Ropeway whisks travelers to the 737-meter summit plateau of active Mount Usu in just six minutes, revealing staggering views into the smoking Ginnuma crater and down upon Showa-Shinzan, a dramatic steaming lava dome that thrust out of flat wheat fields between 1943 and 1945. Lake Toya’s most famous signature tradition is the Toyako Long-Run Fireworks Festival. Every evening from April 28 through October 31, a dedicated fireworks barge cruises across the open water for twenty minutes, launching 450 vibrant shells into the night sky that can be admired free of charge from waterfront promenades, hotel balconies, or outdoor thermal onsen baths overlooking the lake. Lake Toya is located just a 20-minute local bus ride from JR Toya Station on the JR Muroran Main Line.