The active volcanoes in the park are Mount Katmai, Novarupta, Trident Volcano, Mount Mageik, Mount Martin and Fourpeaked Mountain. Other volcanoes that have erupted in recent times in geological terms, but not in historical times, are Mount Douglas, Mount Griggs, Snowy Mountain, Mount Denison, Mount Kukak, Devils Desk, Mount Kaguyak, Mount Cerberus, Falling Mountain and Mount Kejulik. Martin and Mageik produce steam that can be seen from King Salmon, while Trident was active in 1957-1965 and 1968.