Katla , one of Iceland 's most notorious volcanoes , has erupted five times since 1721 , at intervals ranging from 34 to 78 years .
Iceland /location/location/contains Katla
NNP , CD IN NNP POS JJS JJ NNS , VBZ VBN CD NNS IN CD , IN NNS VBG IN CD TO CD NNS .
Iceland
LOCATION
Katla
PERSON
/location/location/contains