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Definition of Thalweg
1. Noun. The middle of the chief navigable channel of a waterway that forms the boundary line between states.
2. Noun. A line following the lowest points of a valley.
Definition of Thalweg
1. n. A line following the lowest part of a valley, whether under water or not.
Definition of Thalweg
1. the line defining the lowest points along the length of a riverbed [n -S]