This is Mt. Iliamna, a stratovolcano, located on the western side of Cook Inlet approximately 30 miles south of Mt. ReDoubt. Both volcanoes are part of the same panoramic view, but unfortunately I am unable to capture them together in the same photograph with my camera.
Iliamna stands at 10,016 ft (3,053 m), and plumes are an almost constant occurrence from the fumarole fields at 8,990 ft (2,740 m).
(click on photos to enlarge)