Fumaroles On Gareloi Island
These fumaroles on Gareloi Island flow at 144°F from 805 feet elevation, creating a 107-degree temperature differential above the maritime climate's 37°F average. The lower-elevation vent on this volcanic island ranks among Alaska's more accessible thermal features despite sitting 30 miles offshore.
Thermal water emerges on volcanic slopes of Gareloi Island, surrounded by barren rock and sparse tundra vegetation. The maritime setting brings consistent wind, fog, and precipitation, with the thermal output visible as steam against the cool ocean air. Annual precipitation reaches 49 inches with 79 inches of annual snow.
These fumaroles formed through Aleutian volcanic processes where subsurface magma heats groundwater to 144°F. The lower elevation compared to nearby fumaroles indicates a shallower geothermal heat source within the volcanic edifice, creating reliable thermal output on permanently protected refuge lands.
Charter vessel or float plane access only—the fumaroles lie 30 miles offshore in the Alaska Maritime National Wildlife Refuge with restricted public access. Summer visits (July through August) during stable weather windows are essential. Permits from the US Fish and Wildlife Service are required. Plan for cold, wet conditions and expect isolation.
Is Fumaroles On Gareloi Island worth visiting?
Best for
- Observing powerful hot springs
- Backpacking adventures
- Winter soaking with dramatic temperature contrast
Not ideal for
- Casual soaking
- Day trips with young children