Mount Shishaldin /ʃᵻˈʃældən/ is a moderately active volcano on Unimak Island in the Aleutian Islands chain of Alaska. It is the highest mountain peak of the Aleutian Islands. The most symmetrical cone-shaped glacier-clad large mountain on earth, the volcano's topographic contour lines are nearly perfect circles above 6,500 feet (2,000 m). The lower north and south slopes are somewhat steeper than the lower eastern and western slopes. The volcano is the westernmost of three large stratovolcanoes along an east–west line in the eastern half of Unimak Island. The Aleuts named the volcano Sisquk, meaning "mountain which points the way when I am lost." The upper 2,000 meters is almost entirely covered by glacial snow and ice. In all, Shishaldin's glacial shield covers about 35 square miles (91 km2). It is flanked to the northwest by 24 monogenetic parasitic cones, an area blanketed by massive lava flows. The Shishaldin cone is less than 10,000 years old and is constructed on a glacially eroded remnant of an ancestral somma and shield. Remnants of the older ancestral volcano are exposed on the west and northeast sides at 1,500–1,800 meters elevation. The Shishaldin edifice contains about 300 cubic kilometers of material. A very steady steam plume rises from its small summit crater which is about 500 feet (150 m) across and slightly breached along the north rim.
By elevation Shishaldin Volcano is
# 1 out of 82 in Aleutians East # 1 out of 297 in the Aleutian Range
By prominence Shishaldin Volcano is
# 7 out of 3806 in Alaska # 12 out of 91437 in USA # 1 out of 82 in Aleutians East # 1 out of 297 in the Aleutian Range
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