Mt. Takahara is a mountain in northern Tochigi prefecture, which stopped it's volcanic activity about 0.1 million years ago .
Valley of the photo is former crater.
Obsidian is yielded in Mt. Takahara. At Kenngamine in left part of the photo, a old stone age mine of obsidian has been found .
Stone tools made of obsidian yielded in Mt. Takahara are found in many parts of the Kanto area.
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