Cordón del Azufre is a small, inactive complex volcano located in the Central Andes, at the border of Argentina and Chile. The centre contains a series of craters and lava flows covering a surface area of . A western component with four craters aligned in a north-south direction on a ridge forms the oldest part. The eastern component is formed by lava flows and craters in Argentina, and the youngest part la Moyra volcano in the western component generated a lava flow that advanced westwards. Weakly porphyritic Andesite and dacite form the rocks of the volcano. No activity, including fumarolic activity, has been recorded at Cordón del Azufre, but the appearance (dark and pristine) and radiometric age (0.3 ± 0.3 mya K-Ar on the most recent flow) of the lava flows suggest a recent age.