#Severn__Severm_River  a river in Ontario that flows northeast into Hudson Bay
  supertype:  #river  a large natural stream of water (larger than a creek); "the river was navigable for 50 miles"
  part of:  #Ontario  a prosperous and industrialized province in central Canada
     part of:  #Canada  a nation in northern North America; the French were the first Europeans to settle in mainland Canada; "the border between the United States and Canada is the longest unguarded border in the world"
        part of:  #North_America  a continent (the third largest) in the western hemisphere connected to South America by the Isthmus of Panama
           part of:  #northern_hemisphere  the hemisphere north of the equator
           part of:  #western_hemisphere__westernhemisphere__occident__New_World  the hemisphere that includes North and South America
           part of:  #the_Americas__America  North and South America

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