thalweg

thalweg (tahl-vayk or -veg).

1. A line following the lowest part of a (usu. submerged) valley.

2. The middle of the primary navigable channel of a waterway, constituting the boundary between states. — Also spelled talweg.

— Also termed midway. [Cases: States 12. 1.]

live thalweg. The part of a river channel that is most followed, usu. at the middle of the principal channel. Louisiana v. Mississippi, 466 U.S. 96, 104 S.Ct. 1645 (1984).

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