#waterway  a navigable body of water
  supertype:  #body_of_water__water  the part of the earth's surface covered with water (such as a river or lake or ocean); "they invaded our territorial waters"; "they were sitting by the water's edge"
  subtype:  #ditch.waterway  any small natural waterway
  subtype:  #mare_clausum  (closed sea) a navigable body of water under the jurisdiction of a single nation
  subtype:  #mare_liberum  (free sea) a navigable body of water to which all nations have equal access
  subtype:  #rapid  a part of a river where the current is very fast

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