#canal  long and narrow strip of water made for boats or for irrigation
  supertype:  conduit__channel  a passage for water (or other fluids)
  instance:  Erie_Canal  New_York_State_Barge_Canal
  part:  lock_chamber  lockage.system
  subtype:  cut.canal  a canal made by erosion or excavation
  subtype:  industrial_watercourse  a canal that is operated by one or more industries
  subtype:  raceway__race  a canal for a current of water
  subtype:  ship_canal__shipway  a canal large enough for sea-going vessels
     subtype:  Panama_Canal  a ship canal 40 miles long across the Isthmus of Panama built by the United State (1904-1914)
     instance:  Suez_Canal

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