Despite its modest summit elevation, a small glacier exists high on the western slopes just below the rim of the summit crater.
A few historical eruptions of Carlisle have been recorded, but its proximity to several other neighboring volcanoes means that there has been some confusion in the older records as to which of the volcanoes was erupting. As the area is extremely remote, distant observations of volcanic plumes cannot be verified for certain.
It is 1.9 miles (3.1km) across the Carlisle Pass from Chuginadak Island and is 5.6 miles (9.0km) northeast of Herbert Island. Carlisle Island has as diameter of 4.3 miles (6.9km).
Map showing volcanoes of Alaska. The mark is set at the location of Mount Carlisle.
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