Fumaroles On Little Sitkin Island
At 2,015 feet on Little Sitkin Island, these fumaroles rank among Earth's most isolated thermal features, accessible only by helicopter or extended ocean voyage across the North Pacific in Alaska's Maritime National Wildlife Refuge.
The fumaroles emerge on volcanic slopes swept by 70 inches of annual snow and 41 inches of rain, creating plumes of steam and gas that rise dramatically from remote, exposed terrain where maritime air temperatures average just 33 degrees Fahrenheit.
Little Sitkin Island's thermal activity results from ongoing volcanic processes in the Aleutian arc, where subduction-zone magmatism powers geothermal systems on this tectonically active island remote even by Alaskan standards.
Access requires special permits and helicopter charter or boat transportation from the Aleutian Islands mainland. Winter conditions and restricted refuge status limit visitation year-round.
Is Fumaroles On Little Sitkin Island worth visiting?
Best for
- Backpacking adventures
Not ideal for
- Day trips with young children