| Fisher Caldera | |
| Elevation Ft: | 3648 |
| Elevation Ref: | [1] |
| Location: | Unimak Island, Alaska, United States |
| Range: | Aleutian Range |
| Coordinates: | 54.6667°N -187°W |
| Type: | Stratovolcano remnant |
| Topo Map: | USGS Unimak C4 |
| Volcanic Arc: | Aleutian Arc |
| Last Eruption: | August 1830 |
Fisher Caldera, also known as Mount Fisher and Fisher Volcano, is a large volcanic caldera, measuring about 11km (07miles) by 18km (11miles), located on Unimak Island in the Aleutian Islands of Alaska. Formed by the destructive eruption of an andesitic stratovolcano about 9,100 years ago, it contains three crater lakes, one 2miles wide and two others about 1.5miles wide. Small peaks rising 600m (2,000feet) and 619m (2,031feet) are also present in the caldera. Fisher Caldera is located just 13miles from the Mount Westdahl volcano.
The largest volcanic eruption on Earth during the Holocene Epoch (the last 11,700 years) occurred at Fisher Caldera in 8700 BCE.[2]