#estuary  the wide part of a river where it nears the sea; fresh and salt water mix
  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"
  instance:  Rio_de_la_Plata
  part of:  river
  subtype:  firth  a long narrow estuary (especially in Scotland)
     subtype:  Firth_of_Forth  a large firth on the east coast of Scotland; location of Edinburgh
     subtype:  Solway_Firth  a large firth on the west coast of Britain between England and Scotland
  subtype:  Para_River__Para  an estuary in northern Brazil into which the Tocantins River flows

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