Semisopochnoi Island, Volcanic island in Aleutians West Census Area, United States.
Semisopochnoi Island is a volcanic landmass in Alaska's Aleutian chain featuring seven peaks, with the highest reaching about 1,200 meters in elevation. The island spreads across open water far from any settlement and is managed as a wildlife refuge today.
Russian explorers recorded this island in the 18th century when Russia controlled Alaska. After the United States purchased Alaska in 1867, the island became part of American territory.
Local Aleut people call this place Unyax, connecting it to their long tradition of hunting and fishing in these remote northern waters.
The island is managed by the Alaska Maritime National Wildlife Refuge and is difficult to reach without authorization. Research visits and scientific work require special permits to protect the sensitive environment.
Mount Cerberus, a three-peaked volcano on the island, erupted between 2021 and 2023 in recent years. These eruptions remind visitors that the landscape here continues to change and reshape itself over time.
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