Assertion: caldera | /r/HasProperty | volcanic crater
Facets:
Source sentences:
text: Box) largest caldera (volcanic crater) in the Dyngjufjöll volcanic massif, in east-central Iceland.
text: It is the second largest caldera (volcanic crater) in the World behind only the vast caldera at Yellowstone National Park in the United States and its age has been hard to determine but eruption rates suggest that Sierra Negra is over 500,000 years old.