thalweg

Definitions of thalweg
  1. noun
    the middle of the chief navigable channel of a waterway that forms the boundary line between states
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    type of:
    bound, boundary, edge
    a line determining the limits of an area
  2. noun
    a line following the lowest points of a valley
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    type of:
    contour, contour line
    a line drawn on a map connecting points of equal height
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