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 […]