The small snow-free crater at the upper right, above and to the right of the light-colored area just right of the center of this NASA International Space Station image (with north to the upper left) is Trolon volcano. It lies in Argentina NE of the Caldera del Agrio (lower right), whose floor contains several lakes, including the U-shaped one at lower right near the SE caldera wall. Trolon is a lava-dome complex with two summit craters and a pyroclastic cone. Snow-covered Copahue volcano (bottom left-center) overlies the western rim of Caldera del Agrio.

NASA International Space Station image ISS006-E-39998, 2003 (http://eol.jsc.nasa.gov/).

This image is made available as a Public Domain Work, but proper attribution is appreciated.

Copahue

Trolon