Its largest historical eruption was at Quizapu Crater , located 15 kilometres ( 9 mi ) to 20 kilometres ( 12 mi ) from the north side of Cerro Azul 's summit .
Its most active volcanoes are Llaima and Villarrica .
Its largest historical eruption was at Quizapu Crater , located 15 kilometres ( 9 mi ) to 20 kilometres ( 12 mi ) from the north side of Cerro Azul 's summit , and its most active volcanoes are Llaima and Villarrica .