Craters

Circular-shaped depressions at the summit of a volcanic core or on the surface of the land caused by the impact of a meteorite; man-made depressions caused by an explosion. [USGS GNIS Feature Class Definitions <http://geonames.usgs.gov/domestic/feature_class.htm>]
This category is also used for calderas.
Alexandria Digital Library Feature Type Thesaurus
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