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Meaning of thalweg

thal•weg

Pronunciation: (täl'veg, -vāk), [key]
— n.
  1. a line, as drawn on a map, connecting the lowest points of a valley.
  2. the middle of the main navigable channel of a waterway that serves as a boundary line between states.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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