thalweg

Noun
  1. The middle of the chief navigable channel of a waterway that forms the boundary line between states (synset 113935701)
    is a type of: bound, boundary, edge - a line determining the limits of an area
  2. A line following the lowest points of a valley (synset 106814723)
    is a type of: contour, contour line - a line drawn on a map connecting points of equal height

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