Mount Aka (赤岳, Aka-dake) is a 2,899m mountain on the border of Chino, Hara of Nagano, and Hokuto of Yamanashi in Japan. This mountain is the tallest mountain of Yatsugatake Mountains. Mount Aka is a stratovolcano. This mountain is a center of the Yatsugatake-Chūshin Kōgen Quasi-National Park.
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