Yunaska (; ) is an uninhabited island which is the largest of the Islands of Four Mountains groupT.P. Miller, R.G. McGimsey, D.H. Richter, J.R. Riehle, C.J. Nye, M.E. Yount, and J.A. Dumoulin,1998. Catalog of the Historically Active Volcanoes of Alaska. USGS, pp.69-70. in the Aleutian Islands of southwestern Alaska, United States. It has a land area of according to the 2000 census.
The island comprises two volcanic mountains, with a valley between. The western mountain is composed of four overlapping and eroded stratovolcanoes, with a cinder cone field at the western end. It has not been historically active. The eastern mountain is a large shield volcano with two overlapping summit calderas, which last erupted in 1937.
References
Yunaska Island: Block 1081, Census Tract 1, Aleutians West Census Area, Alaska United States Census Bureau Yunaska description and statistics, Alaskan Volcano Observatory. T.P. Miller, R.G. McGimsey, D.H. Richter, J.R. Riehle, C.J. Nye, M.E. Yount, and J.A. Dumoulin,1998. Catalog of the Historically Active Volcanoes of Alaska. USGS, pp. 69–70.
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