is an active volcano located on the southern border of Akita and Yamagata in the Tōhoku region of Japan, and is tall. Because of its (roughly) symmetrical shape and massive size, it is also variously known as , or depending on the location of the viewer. In addition to being one of the 100 Famous Landscapes of Japan, it is also included as one of the 100 famous mountains in Japan, and famous 100 Geographical Features of Japan. It is surrounded by Chōkai Quasi-National Park. It is also a National Historic Site of Japan, and is regarded as a sacred mountain by followers of the Shugendō branch of Shinto and is popular with hikers. Outline Mount Chōkai is a complex stratovolcano made of two old and new newer volcanoes, composed primarily of basalt or andesite. Mount Chōkai is shared by two municipalities in Akita Prefecture and four municipalities Yamagata Prefecture; however, its peak is located in Yuza, on the Yamagata side of the border. It is therefore the highest peak in Yamagata, and the second highest in the Tōhoku region after Mt. Hiuchigatake (altitude 2,356 m). The highest elevation of Mount Chōkai within Akita Prefecture has an altitude of 1,775 meters, and thus the mountain is also the highest in Akita Prefecture. From the summit, it is possible to see the Shirakami Mountains and Mount Iwaki to the north, Sado Island to the south and the Pacific Ocean to the east. On the south side of the mountain is “Kokoro Yukikei,” where snow remains in the shape of the kanji for “heart” in even in summer, and portions of the summit have perennial snow, and geological evidence of glaciation in the recent past. Indigenous species of Mount Chōkai include the butterfly thistle and butterfly fish. Eruptions Mount Chōkai is a very active mountain. Known major eruptions occurred: 466 B.C. Causes massive collapse of mountain peak (based on dendrochronology) 810 AD Records of eruption continue to 824. 840 AD Eruption. 871 AD Eruption and lava flow with Volcanic explosion index: VEI 2 939 AD Eruption 1560 AD Eruption 1659-1663 AD Eruptions 1740-1741 AD Eruption 1800-1801 AD Steam explosion, lava flow, formation of a new lava dome: Eight people killed 821 Eruption recorded. 1834 AD Eruption 1971 AD Eruption 1974 AD Steam explosion, small mud flow; Volcanic Explosion Index: VEI 1 History Mount Chōkai has been the object of mountain worship since