It is the southernmost volcano in the Northern Volcanic Zone , a subgroup of Andean volcanoes whose northern limit is Nevado del Ruiz in Colombia ; the next active volcano in the chain , Sabancaya , lies to the south .
It is the southernmost volcano in the Northern Volcanic Zone , a subgroup of Andean volcanoes whose northern limit is Nevado del Ruiz in Colombia . 
 The next active volcano in the chain , Sabancaya , lies in Peru , a distant to the south .