Hot Spring On Unimak Island
Unimak Island hosts a remote thermal spring in one of Alaska's most isolated volcanic landscapes, delivering geothermal heat through federal wildlife refuge protection at 138 feet elevation.
The spring emerges across tundra and volcanic substrate, roughly 3.7 miles from a historic World War II Army trail. Visitors encounter rugged Aleutian terrain shaped by ongoing volcanic activity, with the Alaska Maritime refuge providing protection for this geothermal feature in extreme northern isolation.
The Aleutian Arc's volcanic system feeds this thermal feature, formed by the same geological forces that created the entire island chain. The spring reflects Alaska's rich geothermal heritage, where Aleutian volcanism creates heat sources that sustain life in harsh Arctic waters.
Access requires a moderate hike from the WWII Army Jeep Trail across volcanic tundra. Plan for severe weather typical of the Aleutians; annual snowfall reaches 146 inches. Restricted access applies due to wildlife refuge designation—check with US Fish and Wildlife Service before attempting a visit.