Mount Nasu, Volcanic complex in Tochigi Prefecture, Japan
Mount Nasu forms a group of five peaks in northeastern Honshu and sits within a large protected area of forest and open highland terrain. The landscape shifts between wooded slopes and barren zones near the craters, where sulfur vapors rise from the ground and vegetation remains sparse.
Eruptions began roughly 600,000 years ago in the northern section and built several craters and lava domes over time. Chausu Peak last erupted in November 1963 and remains the only active summit within the entire group.
Mount Nasu holds a position among the 100 Famous Japanese Mountains and features numerous traditional shrines dedicated to natural deities throughout its slopes.
A cable car brings hikers to the upper areas, where several trails lead toward the different peaks. Weather can shift quickly in early fall and late autumn, bringing fog, so visitors should bring warm clothing and sturdy footwear.
Sanbonyari Peak is the highest point in the group and rises to 1,917 meters (6,289 feet), though it holds no active crater. Only Chausu Peak continues to show volcanic activity with visible gas vents along the crater rim.
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