 Cerro Azul ( Spanish pronunciation : [ <unk> <unk> ] , blue hill in Spanish ) , sometimes referred to as Quizapu , is an active stratovolcano in the Maule Region of central Chile , immediately south of Descabezado Grande . Part of the South Volcanic Zone of the Andes , its summit is 3 @,@ 788 metres ( 12 @,@ 428 ft ) above sea level , and is capped by a summit crater that is 500 metres ( 1 @,@ 600 ft ) wide and opens to the north . Beneath the summit , the volcano features numerous scoria cones and flank vents . 
