#river_boat__riverboat  a boat used on rivers or to ply a river
  supertype:  #boat  a small vessel for travel on water
  subtype:  #keelboat  river boat with a shallow draught and a keel but no sails; used to carry freight; moved by rowing or punting or towing
  subtype:  #showboat  a river steamboat on which theatrical performances could be given (especially on the Mississippi River)

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