Copahue (Spanish pronunciation: [koˈpawe]) is a stratovolcano nestled on the border between Argentina and Chile. There are nine volcanic craters along a 2 km (1.2 mi) line and the eastern summit crater contains a briny acidic 300 m (1000 ft) wide crater lake. Twentieth-century eruptions from the crater lake have ejected pyroclastic rocks and chilled liquid sulfur fragments.
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