Isanotski is a stratovolcano, also known as "Ragged Jack" for its rugged and jagged features, that is located on Unimak Island in the Aleutian island chain.
It has not erupted since the 1840's.
Sources of Information:
Charles A. Wood & Jurgen Kienle, 1990 Volcanoes of North America: United States and Canada, Cambridge University Press, Cambridge, p. 45.