Pavlof Sister, Stratovolcano in Alaska Peninsula, United States.

Pavlof Sister is a stratovolcano in the Aleutian Range that displays a classic symmetrical cone shape. The peak reaches approximately 2,140 meters and stands out distinctly against the surrounding mountain landscape.

The volcano was officially mapped and named by the United States Geological Survey in 1929. Scientists recorded the last activity between 1762 and 1786, though they view these historical records with considerable skepticism.

The name "Pavlof Sister" was given by the USGS in 1929 and refers to the peak as the sibling of Pavlof Volcano, which lies directly southwest. The volcano is a parasitic cone of Pavlof, and its last reported eruption, around 1786, is treated as questionable by the USGS.

The site is accessible only by boat or aircraft and lies far from any settlement. Visitors should expect extreme weather, challenging terrain, and the need for professional guidance.

The last reported volcanic activity occurred between 1762 and 1786, though scientists consider this historical data questionable.