Thalweg


From Encyclopedia Britannica (11th edition, 1910)

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Thalweg (a German word compounded from Thal, valley, and Weg, way) in physical geography, a term adopted into English usage signifying the line of greatest slope along the bottom of a valley, i.e. a line drawn through the lowest points of a valley in its downward slope. It thus marks the natural direction of a watercourse.