Nigorikawa, Volcanic caldera in Hokkaido, Japan.
Nigorikawa is a volcanic caldera in southwestern Hokkaido with hot springs and geothermal vents scattered across a broad area. The valley features visible steam and mineral deposits that result from the geological activity beneath the surface.
The area formed through multiple explosive volcanic eruptions, with the most recent major event occurring more than 5,000 years ago. Since then, the caldera has remained geologically active with ongoing thermal features.
The name Nigorikawa means 'turbid water' and reflects the mineral-rich spring that defines the valley. Walking through, you notice steam rising constantly from the ground, creating a landscape shaped by natural forces.
The best time to visit is during the warmer months when trails are easily accessible and weather conditions remain stable. Sturdy footwear is important as the ground is uneven and can be slippery in places.
Continuous monitoring of geothermal activity using sensors contributes to Japan's understanding of volcanic behavior and helps track changes over time. This data feeds into international volcanic research programs, making the site a living laboratory for studying Earth's internal heat.
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